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ObjectDataSource.xml
3485 lines (2946 loc) · 359 KB
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ObjectDataSource.xml
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<Type Name="ObjectDataSource" FullName="System.Web.UI.WebControls.ObjectDataSource">
<TypeSignature Language="C#" Value="public class ObjectDataSource : System.Web.UI.DataSourceControl" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit ObjectDataSource extends System.Web.UI.DataSourceControl" />
<TypeSignature Language="DocId" Value="T:System.Web.UI.WebControls.ObjectDataSource" />
<TypeSignature Language="VB.NET" Value="Public Class ObjectDataSource
Inherits DataSourceControl" />
<TypeSignature Language="F#" Value="type ObjectDataSource = class
 inherit DataSourceControl" />
<TypeSignature Language="C++ CLI" Value="public ref class ObjectDataSource : System::Web::UI::DataSourceControl" />
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>System.Web.UI.DataSourceControl</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultEvent("Selecting")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultEvent("Selecting")>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultProperty("TypeName")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultProperty("TypeName")>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5">
<AttributeName Language="C#">[System.ComponentModel.Designer("System.Web.UI.Design.WebControls.ObjectDataSourceDesigner, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.Designer("System.Web.UI.Design.WebControls.ObjectDataSourceDesigner, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.Drawing.ToolboxBitmap(typeof(System.Web.UI.WebControls.ObjectDataSource))]</AttributeName>
<AttributeName Language="F#">[<System.Drawing.ToolboxBitmap(typeof(System.Web.UI.WebControls.ObjectDataSource))>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.Web.UI.ParseChildren(true)]</AttributeName>
<AttributeName Language="F#">[<System.Web.UI.ParseChildren(true)>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.Web.UI.PersistChildren(false)]</AttributeName>
<AttributeName Language="F#">[<System.Web.UI.PersistChildren(false)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.ComponentModel.Designer("System.Web.UI.Design.WebControls.ObjectDataSourceDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.Designer("System.Web.UI.Design.WebControls.ObjectDataSourceDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents a business object that provides data to data-bound controls in multitier Web application architectures.</summary>
<remarks>
<format type="text/markdown"><
- [Purpose](#purpose)
- [Retrieving Data](#retrieving_data)
- [Performing Data Operations](#performing_data_operations)
- [Filtering Data](#filtering_data)
- [Caching](#caching)
- [Features](#features)
- [Data View](#data_view)
- [Using LINQ to SQL](#using_linq_to_sql)
- [Declarative Syntax](#declarative_syntax)
<a name="introduction"></a>
## Introduction
An <xref:System.Web.UI.WebControls.ObjectDataSource> control works with a class that you create. You create methods that retrieve and update data, and you provide the names of those methods to the <xref:System.Web.UI.WebControls.ObjectDataSource> control in markup. During rendering or postback processing, the <xref:System.Web.UI.WebControls.ObjectDataSource> calls the methods that you have specified.
There is no visual rendering of the <xref:System.Web.UI.WebControls.ObjectDataSource> control. As a result, the <xref:System.Web.UI.WebControls.ObjectDataSource> does not support visual features such as the <xref:System.Web.UI.DataSourceControl.EnableTheming%2A> or <xref:System.Web.UI.DataSourceControl.SkinID%2A> property.
<a name="purpose"></a>
## Purpose
A very common application design practice is to separate the presentation layer from business logic and to encapsulate the business logic in business objects. These business objects form a distinct layer between the presentation layer and the data tier, resulting in a three-tier application architecture. The <xref:System.Web.UI.WebControls.ObjectDataSource> control enables developers to use an ASP.NET data source control while retaining their three-tier application architecture.
The <xref:System.Web.UI.WebControls.ObjectDataSource> control uses reflection to create instances of business objects and to call methods on them to retrieve, update, insert, and delete data. The <xref:System.Web.UI.WebControls.ObjectDataSource.TypeName%2A> property identifies the name of the class that the <xref:System.Web.UI.WebControls.ObjectDataSource> works with. The <xref:System.Web.UI.WebControls.ObjectDataSource> control creates and destroys an instance of the class for each method call; it does not hold the object in memory for the lifetime of the Web request. This is a serious consideration if the business object that you use requires many resources or is otherwise expensive to create and destroy. Using an expensive object might not be an optimal design choice, but you can control the life cycle of the object by using the <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectCreating>, <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectCreated>, and <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectDisposing> events.
> [!NOTE]
> The methods that are identified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A>, <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A>, <xref:System.Web.UI.WebControls.ObjectDataSource.InsertMethod%2A>, and <xref:System.Web.UI.WebControls.ObjectDataSource.DeleteMethod%2A> properties can be instance methods or `static` (`Shared` in Visual Basic) methods. If the methods are `static` (`Shared` in Visual Basic), an instance of the business object is not created, and the <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectCreating>, <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectCreated>, and <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectDisposing> events are not raised.
<a name="retrieving_data"></a>
## Retrieving Data
To retrieve data from a business object, set the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property to the name of the method that retrieves data. If the method does not return an <xref:System.Collections.IEnumerable> or <xref:System.Data.DataSet> object, the object is wrapped by the runtime in an <xref:System.Collections.IEnumerable> collection. If the method signature has parameters, you can add <xref:System.Web.UI.WebControls.Parameter> objects to the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectParameters%2A> collection, and then bind them to the values that you want to pass to the method that is specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property. In order for the <xref:System.Web.UI.WebControls.ObjectDataSource> control to use the parameters, the parameters must match the names and types of the parameters in the method signature. For more information, see [Using Parameters with the ObjectDataSource Control](https://msdn.microsoft.com/library/45fb67ee-9be7-49b7-9421-e242203dafa4).
The <xref:System.Web.UI.WebControls.ObjectDataSource> control retrieves data whenever the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method is called. This method provides programmatic access to the method that is specified by <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property. The method that is specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property is called automatically by controls that are bound to the <xref:System.Web.UI.WebControls.ObjectDataSource> when their `DataBind` method is called. If you set the `DataSourceID` property of a data-bound control, the control automatically binds to data from the data source, as needed. Setting the `DataSourceID` property is the recommended method for binding an <xref:System.Web.UI.WebControls.ObjectDataSource> control to a data-bound control. Alternatively, you can set the `DataSource` property, but then you must explicitly call the `DataBind` method of the data-bound control. You can call the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method programmatically at any time to retrieve data.
For more information about binding data-bound controls to data source controls, see [Binding to Data Using a Data Source Control](https://msdn.microsoft.com/library/e41adfff-8fb8-449e-9cd1-9bd49788c5f7).
<a name="performing_data_operations"></a>
## Performing Data Operations
Depending on the capabilities of the business object that the <xref:System.Web.UI.WebControls.ObjectDataSource> control works with, you can perform data operations, such as updates, insertions, and deletions. To perform these data operations, set the appropriate method name and any associated parameters for the operation that you want to perform. For example, for an update operation, set the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A> property to the name of the business object method that performs updates and add any required parameters to the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateParameters%2A> collection. If the <xref:System.Web.UI.WebControls.ObjectDataSource> control is associated with a data-bound control, the parameters are added by the data-bound control. In this case, you need to ensure that the parameter names of the method match the field names in the data-bound control. The update is performed when the <xref:System.Web.UI.WebControls.ObjectDataSource.Update%2A> method is called, either explicitly by your code or automatically by a data-bound control. The same general pattern is followed for <xref:System.Web.UI.WebControls.ObjectDataSource.Delete%2A> and <xref:System.Web.UI.WebControls.ObjectDataSource.Insert%2A> operations. Business objects are assumed to perform these types of data operations one record at a time, rather than batched.
<a name="filtering_data"></a>
## Filtering Data
The <xref:System.Web.UI.WebControls.ObjectDataSource> control can filter data that is retrieved by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property, if the data is returned as a <xref:System.Data.DataSet> or <xref:System.Data.DataTable> object. You can set the <xref:System.Web.UI.WebControls.ObjectDataSource.FilterExpression%2A> property to a filtering expression by using a format string syntax and bind values in the expression to parameters that are specified in the <xref:System.Web.UI.WebControls.ObjectDataSource.FilterParameters%2A> collection.
<a name="caching"></a>
## Caching
Although the <xref:System.Web.UI.WebControls.ObjectDataSource> does not retain the instance of the business object across multiple requests, it can cache the result of calling the method identified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property. While the data is cached, subsequent calls to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method return the cached data instead of creating the business object and calling its <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> using reflection. Caching lets you avoid creating the object and calling its data method at the expense of memory on the Web server. The <xref:System.Web.UI.WebControls.ObjectDataSource> automatically caches data when the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property is set to `true`, and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property is set to the number of seconds that the cache stores data before the cache is discarded. You can also specify a <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> property and an optional <xref:System.Web.UI.WebControls.ObjectDataSource.SqlCacheDependency%2A> property. The <xref:System.Web.UI.WebControls.ObjectDataSource> control allows you to cache all types of data, but you should not cache objects that retain resources or state that cannot be shared to service multiple requests (for example, an open <xref:System.Data.SqlClient.SqlDataReader> object), because the same instance of the object will be used to service multiple requests.
<a name="features"></a>
## Features
The following table describes the features of the <xref:System.Web.UI.WebControls.ObjectDataSource> control.
|Capability|Requirements|
|----------------|------------------|
|Selecting|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property to the name of the business object method that selects data, and include any necessary parameters in the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectParameters%2A> collection either programmatically or by using a data-bound control.|
|Sorting|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.SortParameterName%2A> property to the name of the parameter in the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> method that carries the sort criteria.|
|Filtering|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.FilterExpression%2A> property to a filtering expression and optionally add any parameters to the <xref:System.Web.UI.WebControls.ObjectDataSource.FilterParameters%2A> collection to filter the data when the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method is called. The method specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property must return a <xref:System.Data.DataSet> or <xref:System.Data.DataTable>.|
|Paging|Data source paging is supported, if the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> method contains parameters for the maximum number of records to retrieve and the index of the first record to retrieve. The names of those parameters must be set in the <xref:System.Web.UI.WebControls.ObjectDataSource.MaximumRowsParameterName%2A> and <xref:System.Web.UI.WebControls.ObjectDataSource.StartRowIndexParameterName%2A> properties, respectively. A data-bound control might be able to perform paging itself, even if the <xref:System.Web.UI.WebControls.ObjectDataSource> control does not support paging directly in the method specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property. The requirement for the data-bound control to be able to do this is that the method specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property return an object that implements the <xref:System.Collections.ICollection> interface.|
|Updating|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A> property to the name of the business object method that updates data, and include any necessary parameters in the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateParameters%2A> collection.|
|Deleting|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.DeleteMethod%2A> property to the name of the business object method or function that deletes data, and include any necessary parameters in the <xref:System.Web.UI.WebControls.ObjectDataSource.DeleteParameters%2A> collection.|
|Inserting|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.InsertMethod%2A> property to the name of the business object method or function that inserts data, and include any necessary parameters in the <xref:System.Web.UI.WebControls.ObjectDataSource.InsertParameters%2A> collection.|
|Caching|Set the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property to `true`, and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> and <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> properties according to the caching behavior you want for your cached data.|
> [!NOTE]
> When you use the <xref:System.Web.UI.WebControls.ObjectDataSource> class to update or insert data, strings that are entered at the client are not automatically converted from the client culture format to the server culture format. For example, the client culture might specify DD/MM/YYYY as the date format, and the date format on the server might be MM/DD/YYYY. In that case, October 5, 2009 would be entered in a <xref:System.Web.UI.WebControls.TextBox> control as 5/10/2009 but would be interpreted as May 10, 2009. October 15, 2009 would be entered as 15/10/2009, and would be rejected as an invalid date.
<a name="data_view"></a>
## Data View
As with all data source controls, the <xref:System.Web.UI.WebControls.ObjectDataSource> control is associated with a data source view class. While the <xref:System.Web.UI.WebControls.ObjectDataSource> control is the interface that the page developer uses to work with data, the <xref:System.Web.UI.WebControls.ObjectDataSourceView> class is the interface that data-bound controls work with. Additionally, the <xref:System.Web.UI.WebControls.ObjectDataSourceView> class describes the capabilities of the data source control, and performs the actual work. The <xref:System.Web.UI.WebControls.ObjectDataSource> control has only one associated <xref:System.Web.UI.WebControls.ObjectDataSourceView>, and it is always named `DefaultView`. While the <xref:System.Web.UI.WebControls.ObjectDataSourceView> object is exposed by the <xref:System.Web.UI.WebControls.ObjectDataSource.GetView%2A> method, many of its properties and methods are wrapped and exposed directly by the <xref:System.Web.UI.WebControls.ObjectDataSource> control. Behind the scenes, the <xref:System.Web.UI.WebControls.ObjectDataSourceView> object performs all data operations, including retrieving, inserting, updating, deleting, filtering, and sorting the data. For more information, see <xref:System.Web.UI.WebControls.ObjectDataSourceView>.
<a name="using_linq_to_sql"></a>
## Using LINQ to SQL
You can use the <xref:System.Web.UI.WebControls.ObjectDataSource> control with a LINQ to SQL class. To do so, you set the <xref:System.Web.UI.WebControls.ObjectDataSource.TypeName%2A> property to the name of the data-context class. You also set the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A>, <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A>, <xref:System.Web.UI.WebControls.ObjectDataSource.InsertMethod%2A>, and <xref:System.Web.UI.WebControls.ObjectDataSource.DeleteMethod%2A> methods to the methods in the data-context class that perform the corresponding operations. You must create an event handler for the <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectDisposing> event in order to cancel disposing of the data-context class. This step is necessary because LINQ to SQL supports deferred execution, whereas the <xref:System.Web.UI.WebControls.ObjectDataSource> control tries to dispose the data context after the Select operation. For more information about how to create LINQ to SQL classes, see [How to: Create LINQ to SQL Classes in a Web Project](https://msdn.microsoft.com/library/20bf925f-2a6d-410d-8f65-7b5b8f555081). For an example of how to cancel the disposing of a data context class, see the <xref:System.Web.UI.WebControls.ObjectDataSource.ObjectDisposing> event.
## Using the Entity Framework
You can also use the <xref:System.Web.UI.WebControls.ObjectDataSource> control with the Entity Framework. For more information, see [Using the Entity Framework and the ObjectDataSource Control](https://go.microsoft.com/fwlink/?LinkId=209117).
<a name="declarative_syntax"></a>
## Declarative Syntax
```
<asp:ObjectDataSource
CacheDuration="string|Infinite"
CacheExpirationPolicy="Absolute|Sliding"
CacheKeyDependency="string"
ConflictDetection="OverwriteChanges|CompareAllValues"
ConvertNullToDBNull="True|False"
DataObjectTypeName="string"
DeleteMethod="string"
EnableCaching="True|False"
EnablePaging="True|False"
EnableTheming="True|False"
EnableViewState="True|False"
FilterExpression="string"
ID="string"
InsertMethod="string"
MaximumRowsParameterName="string"
OldValuesParameterFormatString="string"
OnDataBinding="DataBinding event handler"
OnDeleted="Deleted event handler"
OnDeleting="Deleting event handler"
OnDisposed="Disposed event handler"
OnFiltering="Filtering event handler"
OnInit="Init event handler"
OnInserted="Inserted event handler"
OnInserting="Inserting event handler"
OnLoad="Load event handler"
OnObjectCreated="ObjectCreated event handler"
OnObjectCreating="ObjectCreating event handler"
OnObjectDisposing="ObjectDisposing event handler"
OnPreRender="PreRender event handler"
OnSelected="Selected event handler"
OnSelecting="Selecting event handler"
OnUnload="Unload event handler"
OnUpdated="Updated event handler"
OnUpdating="Updating event handler"
runat="server"
SelectCountMethod="string"
SelectMethod="string"
SkinID="string"
SortParameterName="string"
SqlCacheDependency="string"
StartRowIndexParameterName="string"
TypeName="string"
UpdateMethod="string"
Visible="True|False"
>
<DeleteParameters>
<asp:ControlParameter
ControlID="string"
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:CookieParameter
ConvertEmptyStringToNull="True|False"
CookieName="string"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:FormParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
FormField="string"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:Parameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:ProfileParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:QueryStringParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
QueryStringField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:SessionParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
SessionField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
</DeleteParameters>
<FilterParameters>
<asp:ControlParameter
ControlID="string"
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:CookieParameter
ConvertEmptyStringToNull="True|False"
CookieName="string"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:FormParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
FormField="string"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:Parameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:ProfileParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:QueryStringParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
QueryStringField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:SessionParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
SessionField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
</FilterParameters>
<InsertParameters>
<asp:ControlParameter
ControlID="string"
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:CookieParameter
ConvertEmptyStringToNull="True|False"
CookieName="string"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:FormParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
FormField="string"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:Parameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:ProfileParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:QueryStringParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
QueryStringField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:SessionParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
SessionField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
</InsertParameters>
<SelectParameters>
<asp:ControlParameter
ControlID="string"
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:CookieParameter
ConvertEmptyStringToNull="True|False"
CookieName="string"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:FormParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
FormField="string"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:Parameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:ProfileParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:QueryStringParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
QueryStringField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:SessionParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
SessionField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
</SelectParameters>
<UpdateParameters>
<asp:ControlParameter
ControlID="string"
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:CookieParameter
ConvertEmptyStringToNull="True|False"
CookieName="string"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:FormParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
FormField="string"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:Parameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:ProfileParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
PropertyName="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:QueryStringParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
QueryStringField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
<asp:SessionParameter
ConvertEmptyStringToNull="True|False"
DefaultValue="string"
Direction="Input|Output|InputOutput|ReturnValue"
Name="string"
SessionField="string"
Size="integer"
Type="Empty|Object|DBNull|Boolean|Char|SByte|
Byte|Int16|UInt16|Int32|UInt32|Int64|UInt64|
Single|Double|Decimal|DateTime|String"
/>
</UpdateParameters>
</asp:ObjectDataSource>
```
## Examples
This section shows an <xref:System.Web.UI.WebControls.ObjectDataSource> in markup in an .aspx page and it shows the business objects that it works with. The example is the .aspx page. It contains a <xref:System.Web.UI.WebControls.GridView> control that is bound to an <xref:System.Web.UI.WebControls.ObjectDataSource> control. The <xref:System.Web.UI.WebControls.ObjectDataSource> control markup specifies the name of the business object and the name of the business object method to call in order to retrieve data.
:::code language="aspx-csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_1/CS/objds1cs.aspx" id="Snippet1":::
:::code language="aspx-vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_1/VB/objds1vb.aspx" id="Snippet1":::
The following example shows the business object that the <xref:System.Web.UI.WebControls.ObjectDataSource> control in the .aspx page uses. (Many other <xref:System.Web.UI.WebControls.ObjectDataSource> code examples use this business object also.) The example consists of the following two basic classes:
- The `EmployeeLogic` class is the business logic class that the <xref:System.Web.UI.WebControls.ObjectDataSource> uses.
- The `NorthwindEmployee` class defines the data object that is returned by the `GetAllEmployees` method of the `EmployeeLogic` class.
An additional `NorthwindDataException` class is provided as a convenience.
This set of example classes works with the Northwind Traders database, which is available with Microsoft SQL Server and Microsoft Access. For a complete working example, you must compile and use these classes with the .aspx page example that is provided.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_1/CS/northwindemployee1.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_1/VB/northwindemployee1.vb" id="Snippet2":::
]]></format>
</remarks>
<altmember cref="T:System.Web.UI.IDataSource" />
<altmember cref="T:System.Web.UI.DataSourceControl" />
<altmember cref="T:System.Web.UI.WebControls.ObjectDataSourceView" />
<related type="Article" href="https://msdn.microsoft.com/library/a806fa2c-fe6a-405f-869c-74e804a642ea">Walkthrough: Data Binding to a Custom Business Object</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
<related type="ExternalDocumentation" href="https://go.microsoft.com/fwlink/?LinkId=214011">Using the Entity Framework and the ObjectDataSource Control</related>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> class.</summary>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public ObjectDataSource ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.ObjectDataSource.#ctor" />
<MemberSignature Language="VB.NET" Value="Public Sub New ()" />
<MemberSignature Language="C++ CLI" Value="public:
 ObjectDataSource();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> class.</summary>
<remarks>To be added.</remarks>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public ObjectDataSource (string typeName, string selectMethod);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(string typeName, string selectMethod) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.ObjectDataSource.#ctor(System.String,System.String)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (typeName As String, selectMethod As String)" />
<MemberSignature Language="F#" Value="new System.Web.UI.WebControls.ObjectDataSource : string * string -> System.Web.UI.WebControls.ObjectDataSource" Usage="new System.Web.UI.WebControls.ObjectDataSource (typeName, selectMethod)" />
<MemberSignature Language="C++ CLI" Value="public:
 ObjectDataSource(System::String ^ typeName, System::String ^ selectMethod);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="typeName" Type="System.String" />
<Parameter Name="selectMethod" Type="System.String" />
</Parameters>
<Docs>
<param name="typeName">The name of the class that the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> works with.</param>
<param name="selectMethod">The name of the method or function that the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> invokes to retrieve data.</param>
<summary>Initializes a new instance of the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> class with the specified type name and data retrieval method name.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The value of the `typeName` parameter can be a partially qualified type for code that is located in the Bin or App_Code directory or a fully qualified type name for code that is registered in the global assembly cache. If you use the global assembly cache, you must add the appropriate reference to the `assemblies` section of the Machine.config or Web.config configuration file.
]]></format>
</remarks>
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.TypeName" />
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.SelectMethod" />
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.SelectParameters" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="CacheDuration">
<MemberSignature Language="C#" Value="public virtual int CacheDuration { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 CacheDuration" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.CacheDuration" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property CacheDuration As Integer" />
<MemberSignature Language="F#" Value="member this.CacheDuration : int with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.CacheDuration" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property int CacheDuration { int get(); void set(int value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue(0)]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue(0)>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.TypeConverter(typeof(System.Web.UI.DataSourceCacheDurationConverter))]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.TypeConverter(typeof(System.Web.UI.DataSourceCacheDurationConverter))>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the length of time, in seconds, that the data source control caches data that is retrieved by the <see cref="P:System.Web.UI.WebControls.ObjectDataSource.SelectMethod" /> property.</summary>
<value>The number of seconds that the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> caches the results of a <see cref="P:System.Web.UI.WebControls.ObjectDataSource.SelectMethod" /> property invocation. The default is 0. The value cannot be negative.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.ObjectDataSource> control supports data caching. While data is cached, calls to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method retrieve data from the cache rather than from the business object that the <xref:System.Web.UI.WebControls.ObjectDataSource> works with. When the cache expires, the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method retrieves data from the business object, and then caches the data again.
The <xref:System.Web.UI.WebControls.ObjectDataSource> control automatically caches data when the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property is set to `true` and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property is set to a value greater than 0, which indicates the number of seconds that the cache stores data before the cache entry is discarded. A value of 0 indicates an infinitely long cache.
The cache is regulated by a combination of the duration and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> setting. If the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> property is set to the <xref:System.Web.UI.DataSourceCacheExpiry.Absolute> value, the <xref:System.Web.UI.WebControls.ObjectDataSource> caches data on the first call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method and holds it in memory for, at most, the amount of time that is specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property. The data might be released before the duration time, if the memory is needed. The cache is then refreshed during the next call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method. If the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> property is set to <xref:System.Web.UI.DataSourceCacheExpiry.Sliding> value, the data source control caches data on the first call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method, but resets the time window for which it holds the cache on each subsequent call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method. The cache expires if there is no activity for a time that is equal to the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property since the last call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method.
## Examples
This section contains two code examples. The first code example demonstrates how an <xref:System.Web.UI.WebControls.ObjectDataSource> object supports caching. The second code example demonstrates how to implement a wrapper method that returns a <xref:System.Data.DataSet> object to enable caching with an <xref:System.Web.UI.WebControls.ObjectDataSource> object.
The following code example demonstrates how an <xref:System.Web.UI.WebControls.ObjectDataSource> control supports caching. To enable caching, you must implement the method that retrieves data, which is identified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property, to return the data as a <xref:System.Data.DataSet> object. In this example, the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property is set to `true`, and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> and <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> properties are set. The <xref:System.Web.UI.WebControls.ObjectDataSource> caches data that is returned by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property for 30 seconds.
:::code language="aspx-csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_6/CS/objds6cs.aspx" id="Snippet1":::
:::code language="aspx-vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_6/VB/objds6vb.aspx" id="Snippet1":::
The following code example demonstrates how to implement a wrapper method that returns a <xref:System.Data.DataSet> object to enable caching with an <xref:System.Web.UI.WebControls.ObjectDataSource> control. In the base implementation of the `EmployeeLogic` class, the `GetAllEmployees` method returns an <xref:System.Collections.ArrayList> object. Instead of refactoring the object completely to work with the <xref:System.Web.UI.WebControls.ObjectDataSource> on a Web Forms page, a wrapper method named `GetAllEmployeesAsDataSet` is added that returns a set of `NorthwindEmployee` data as a <xref:System.Data.DataSet>.
This code example is part of a larger example provided for the <xref:System.Web.UI.WebControls.ObjectDataSource> class.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_5/CS/northwindemployee5.cs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_5/VB/northwindemployee5.vb" id="Snippet3":::
]]></format>
</remarks>
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy" />
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.EnableCaching" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="CacheExpirationPolicy">
<MemberSignature Language="C#" Value="public virtual System.Web.UI.DataSourceCacheExpiry CacheExpirationPolicy { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance valuetype System.Web.UI.DataSourceCacheExpiry CacheExpirationPolicy" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property CacheExpirationPolicy As DataSourceCacheExpiry" />
<MemberSignature Language="F#" Value="member this.CacheExpirationPolicy : System.Web.UI.DataSourceCacheExpiry with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property System::Web::UI::DataSourceCacheExpiry CacheExpirationPolicy { System::Web::UI::DataSourceCacheExpiry get(); void set(System::Web::UI::DataSourceCacheExpiry value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue(System.Web.UI.DataSourceCacheExpiry.Absolute)]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue(System.Web.UI.DataSourceCacheExpiry.Absolute)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Web.UI.DataSourceCacheExpiry</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the cache expiration behavior that, when combined with the duration, describes the behavior of the cache that the data source control uses.</summary>
<value>One of the <see cref="T:System.Web.UI.DataSourceCacheExpiry" /> values. The default is <see cref="F:System.Web.UI.DataSourceCacheExpiry.Absolute" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.ObjectDataSource> control supports data caching. While data is cached, calls to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method retrieve data from the cache rather than from the business object that the <xref:System.Web.UI.WebControls.ObjectDataSource> works with. When the cache expires, the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method retrieves data from the business object, and then caches the data again.
The <xref:System.Web.UI.WebControls.ObjectDataSource> control automatically caches data when the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property is set to `true` and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property is set to a value greater than 0, which indicates the number of seconds that the cache stores data before the cache entry is discarded. A value of 0 indicates an infinitely long cache period.
The cache is regulated by a combination of the duration and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> setting. If the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> property is set to the <xref:System.Web.UI.DataSourceCacheExpiry.Absolute> value, the <xref:System.Web.UI.WebControls.ObjectDataSource> caches data on the first call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method and holds it in memory for, at most, the amount of time that is specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property. The data might be released before the duration time, if the memory is needed. The cache is then refreshed during the next call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method. If the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> property is set to the <xref:System.Web.UI.DataSourceCacheExpiry.Sliding> value, the data source control caches data on the first call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method, but resets the time window for which it holds the cache for each subsequent call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method. The cache expires if there is no activity for a time that is equal to the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> property since the last call to the <xref:System.Web.UI.WebControls.ObjectDataSource.Select%2A> method.
## Examples
This section contains two code examples. The first code example demonstrates how an <xref:System.Web.UI.WebControls.ObjectDataSource> object supports filtering and caching. The second code example demonstrates how to implement a wrapper method that returns a <xref:System.Data.DataSet> object to enable caching and filtering with an <xref:System.Web.UI.WebControls.ObjectDataSource> object.
The following code example demonstrates how an <xref:System.Web.UI.WebControls.ObjectDataSource> control supports filtering and caching. To enable filtering and caching, you must implement the method that retrieves data, which is identified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property, to return the data as a <xref:System.Data.DataSet> object. In this example, caching is enabled because the `EmployeeLogic` object returns data as a <xref:System.Data.DataSet>, the <xref:System.Web.UI.WebControls.ObjectDataSource.EnableCaching%2A> property is set to `true`, and the <xref:System.Web.UI.WebControls.ObjectDataSource.CacheDuration%2A> and <xref:System.Web.UI.WebControls.ObjectDataSource.CacheExpirationPolicy%2A> properties are set. The <xref:System.Web.UI.WebControls.ObjectDataSource> caches data that is returned by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property for 30 seconds.
:::code language="aspx-csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_6/CS/objds6cs.aspx" id="Snippet1":::
:::code language="aspx-vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_6/VB/objds6vb.aspx" id="Snippet1":::
The following code example demonstrates how to implement a wrapper method that returns a <xref:System.Data.DataSet> object to enable caching and filtering with an <xref:System.Web.UI.WebControls.ObjectDataSource> control. In the base implementation of the `EmployeeLogic` class, the `GetAllEmployees` method returns an <xref:System.Collections.ArrayList>. Instead of refactoring the object completely to work with the <xref:System.Web.UI.WebControls.ObjectDataSource> on a Web Forms page, a wrapper method named `GetAllEmployeesAsDataSet` is added that returns a set of `NorthwindEmployee` data as a <xref:System.Data.DataSet>. This code example is part of a larger example provided for the <xref:System.Web.UI.WebControls.ObjectDataSource> class.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_5/CS/northwindemployee5.cs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_5/VB/northwindemployee5.vb" id="Snippet3":::
]]></format>
</remarks>
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.CacheDuration" />
<altmember cref="P:System.Web.UI.WebControls.ObjectDataSource.EnableCaching" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="CacheKeyDependency">
<MemberSignature Language="C#" Value="public virtual string CacheKeyDependency { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance string CacheKeyDependency" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.CacheKeyDependency" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property CacheKeyDependency As String" />
<MemberSignature Language="F#" Value="member this.CacheKeyDependency : string with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.CacheKeyDependency" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property System::String ^ CacheKeyDependency { System::String ^ get(); void set(System::String ^ value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue("")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue("")>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets a user-defined key dependency that is linked to all data cache objects that are created by the data source control.</summary>
<value>A key that identifies all cache objects created by the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" />.</value>
<remarks>
<format type="text/markdown"><.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_18/CS/App_Code/EmployeeLogic.cs" id="Snippet5":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/System.Web.UI.WebControls.ObjectDataSource_18/VB/App_Code/EmployeeLogic.vb" id="Snippet5":::
]]></format>
</remarks>
<altmember cref="T:System.Web.Caching.SqlCacheDependency" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="ConflictDetection">
<MemberSignature Language="C#" Value="public System.Web.UI.ConflictOptions ConflictDetection { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance valuetype System.Web.UI.ConflictOptions ConflictDetection" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.ConflictDetection" />
<MemberSignature Language="VB.NET" Value="Public Property ConflictDetection As ConflictOptions" />
<MemberSignature Language="F#" Value="member this.ConflictDetection : System.Web.UI.ConflictOptions with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.ConflictDetection" />
<MemberSignature Language="C++ CLI" Value="public:
 property System::Web::UI::ConflictOptions ConflictDetection { System::Web::UI::ConflictOptions get(); void set(System::Web::UI::ConflictOptions value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue(System.Web.UI.ConflictOptions.OverwriteChanges)]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue(System.Web.UI.ConflictOptions.OverwriteChanges)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Web.UI.ConflictOptions</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets a value that determines whether or not just the new values are passed to the <see langword="Update" /> method or both the old and new values are passed to the <see langword="Update" /> method.</summary>
<value>One of the <see cref="T:System.Web.UI.ConflictOptions" /> values. The default is <see cref="F:System.Web.UI.ConflictOptions.OverwriteChanges" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This property determines whether parameters for old and new values are applied to the method specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A> property. For example, if the method that is specified by the <xref:System.Web.UI.WebControls.ObjectDataSource.SelectMethod%2A> property returns a <xref:System.Data.DataTable> control with the columns `Name` and `Number`, and the <xref:System.Web.UI.WebControls.ObjectDataSource.ConflictDetection%2A> property is set to the <xref:System.Web.UI.ConflictOptions.OverwriteChanges> field, parameters are created for `Name` and `Number` for the `Update` method. If the <xref:System.Web.UI.WebControls.ObjectDataSource.ConflictDetection%2A> property is set to the <xref:System.Web.UI.ConflictOptions.CompareAllValues> value, parameters are created for `Name`, `Number`, `original_Name`, and `original_Number`. (The exact name of the parameters for the original values depends on the <xref:System.Web.UI.WebControls.ObjectDataSource.OldValuesParameterFormatString%2A> property.) The <xref:System.Web.UI.WebControls.ObjectDataSource> then determines whether the method that is specified in the <xref:System.Web.UI.WebControls.ObjectDataSource.UpdateMethod%2A> property has parameters that match.
Concurrency control is a technique that data stores use to control how data is read and changed in the store when multiple clients are accessing and manipulating the same data. For example, one client reads data and presents it to a user, while another client reads the same data and presents it to a different user. If both users update the data and submit it to the data storage, an unexpected result might occur, because both clients might provide different values for the same data. This is considered a conflict. By setting the <xref:System.Web.UI.WebControls.ObjectDataSource.ConflictDetection%2A> property to the <xref:System.Web.UI.ConflictOptions.CompareAllValues> value, the `Update` method can then compare the old and new values to the original data source to detect conflicts and handle them as necessary.
The <xref:System.Web.UI.WebControls.ObjectDataSource.ConflictDetection%2A> property delegates to the <xref:System.Web.UI.WebControls.ObjectDataSourceView.ConflictDetection%2A> property of the <xref:System.Web.UI.WebControls.ObjectDataSourceView> object that is associated with the <xref:System.Web.UI.WebControls.ObjectDataSource> control.
]]></format>
</remarks>
<altmember cref="T:System.Web.UI.ConflictOptions" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="ConvertNullToDBNull">
<MemberSignature Language="C#" Value="public bool ConvertNullToDBNull { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool ConvertNullToDBNull" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.ConvertNullToDBNull" />
<MemberSignature Language="VB.NET" Value="Public Property ConvertNullToDBNull As Boolean" />
<MemberSignature Language="F#" Value="member this.ConvertNullToDBNull : bool with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.ConvertNullToDBNull" />
<MemberSignature Language="C++ CLI" Value="public:
 property bool ConvertNullToDBNull { bool get(); void set(bool value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue(false)]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue(false)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets a value indicating whether the <see cref="T:System.Web.UI.WebControls.Parameter" /> values that are passed to an update, insert, or delete operation are automatically converted from <see langword="null" /> to the <see cref="F:System.DBNull.Value" /> value by the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> control.</summary>
<value>
<see langword="true" />, if any <see langword="null" /> values in <see cref="T:System.Web.UI.WebControls.Parameter" /> objects passed to the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> control are automatically converted to <see cref="F:System.DBNull.Value" /> values; otherwise, <see langword="false" />. The default is <see langword="false" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Not converting `null` to the <xref:System.DBNull.Value> value can result in errors at run time. Use the <xref:System.Web.UI.WebControls.ObjectDataSource.ConvertNullToDBNull%2A> property to indicate whether <xref:System.Web.UI.WebControls.Parameter> values that are passed to an update, insert, or delete operation are automatically converted from `null` to the <xref:System.DBNull.Value> value by the <xref:System.Web.UI.WebControls.ObjectDataSource> control.
]]></format>
</remarks>
<altmember cref="F:System.DBNull.Value" />
<altmember cref="T:System.Web.UI.WebControls.ObjectDataSource" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms247258(v=vs.100)">Data Source Web Server Controls</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/9a4kyhcx(v=vs.100)">ObjectDataSource Control Overview</related>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/ms227436(v=vs.100)">Creating an ObjectDataSource Control Source Object</related>
</Docs>
</Member>
<Member MemberName="DataObjectTypeName">
<MemberSignature Language="C#" Value="public string DataObjectTypeName { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance string DataObjectTypeName" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.ObjectDataSource.DataObjectTypeName" />
<MemberSignature Language="VB.NET" Value="Public Property DataObjectTypeName As String" />
<MemberSignature Language="F#" Value="member this.DataObjectTypeName : string with get, set" Usage="System.Web.UI.WebControls.ObjectDataSource.DataObjectTypeName" />
<MemberSignature Language="C++ CLI" Value="public:
 property System::String ^ DataObjectTypeName { System::String ^ get(); void set(System::String ^ value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.ComponentModel.DefaultValue("")]</AttributeName>
<AttributeName Language="F#">[<System.ComponentModel.DefaultValue("")>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the name of a class that the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> control uses for a parameter in an update, insert, or delete data operation, instead of passing individual values from the data-bound control.</summary>
<value>A partially or fully qualified class name that identifies the type of the object that the <see cref="T:System.Web.UI.WebControls.ObjectDataSource" /> can use as a parameter for an <see cref="M:System.Web.UI.WebControls.ObjectDataSource.Insert" />, <see cref="M:System.Web.UI.WebControls.ObjectDataSource.Update" />, or a <see cref="M:System.Web.UI.WebControls.ObjectDataSource.Delete" /> operation. The default is an empty string ("").</value>
<remarks>
<format type="text/markdown"><![CDATA[