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RadioButtonList.xml
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RadioButtonList.xml
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<Type Name="RadioButtonList" FullName="System.Web.UI.WebControls.RadioButtonList">
<TypeSignature Language="C#" Value="public class RadioButtonList : System.Web.UI.WebControls.ListControl, System.Web.UI.INamingContainer, System.Web.UI.IPostBackDataHandler, System.Web.UI.WebControls.IRepeatInfoUser" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit RadioButtonList extends System.Web.UI.WebControls.ListControl implements class System.Web.UI.INamingContainer, class System.Web.UI.IPostBackDataHandler, class System.Web.UI.WebControls.IRepeatInfoUser" />
<TypeSignature Language="DocId" Value="T:System.Web.UI.WebControls.RadioButtonList" />
<TypeSignature Language="VB.NET" Value="Public Class RadioButtonList
Inherits ListControl
Implements INamingContainer, IPostBackDataHandler, IRepeatInfoUser" />
<TypeSignature Language="C++ CLI" Value="public ref class RadioButtonList : System::Web::UI::WebControls::ListControl, System::Web::UI::INamingContainer, System::Web::UI::IPostBackDataHandler, System::Web::UI::WebControls::IRepeatInfoUser" />
<TypeSignature Language="F#" Value="type RadioButtonList = class
 inherit ListControl
 interface IRepeatInfoUser
 interface INamingContainer
 interface IPostBackDataHandler" />
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>System.Web.UI.WebControls.ListControl</BaseTypeName>
</Base>
<Interfaces>
<Interface>
<InterfaceName>System.Web.UI.INamingContainer</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Web.UI.IPostBackDataHandler</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Web.UI.WebControls.IRepeatInfoUser</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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">
<AttributeName>System.Web.UI.SupportsEventValidation</AttributeName>
</Attribute>
<Attribute>
<AttributeName>System.Web.UI.ValidationProperty("SelectedItem")</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents a list control that encapsulates a group of radio button controls.</summary>
<remarks>
<format type="text/markdown"><
- [Specifying List Layout](#specifying_list_layout)
- [Accessibility](#accessibility)
- [Declarative Syntax](#declarative_syntax)
<a name="introduction"></a>
## Introduction
The <xref:System.Web.UI.WebControls.RadioButtonList> control provides page developers with a single-selection radio button group that can be dynamically generated through data binding. It contains an <xref:System.Web.UI.WebControls.ListControl.Items%2A> collection with members that correspond to individual items on the list. To determine which item is selected, test the <xref:System.Web.UI.WebControls.ListControl.SelectedItem%2A> property of the list.
<a name="specifying_list_layout"></a>
## Specifying List Layout
You can specify how the list is rendered by setting the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> and <xref:System.Web.UI.WebControls.RadioButtonList.RepeatDirection%2A> properties. For information about layout options, see the <xref:System.Web.UI.WebControls.RepeatLayout> enumeration.
By default, <xref:System.Web.UI.WebControls.RadioButtonList.RepeatDirection%2A> is set to `RepeatDirection.Vertical`. Setting this property to `RepeatDirection.Horizontal` causes the control to render the list horizontally. Some <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> settings do not allow horizontal layout. For more information, see the <xref:System.Web.UI.WebControls.RepeatLayout> enumeration.
> [!CAUTION]
> This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a <xref:System.Web.UI.WebControls.RadioButtonList> control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see [Securing Standard Controls](https://msdn.microsoft.com/library/f3e7718f-63d0-44a3-bd5f-48cc2059c2a8), [How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings](https://msdn.microsoft.com/library/6f67973f-dda0-45a1-ba9d-e88532d7dc5b), and [Validating User Input in ASP.NET Web Pages](https://msdn.microsoft.com/library/4ad3dacb-89e0-4cee-89ac-40a3f2a85461).
<a name="accessibility"></a>
## Accessibility
For information about how to configure this control so that it generates markup that conforms to accessibility standards, see [Accessibility in Visual Studio and ASP.NET](https://msdn.microsoft.com/library/7e3ce9c4-6b7d-4fb1-94b5-72cf2a44fe13) and [ASP.NET Controls and Accessibility](https://msdn.microsoft.com/library/847a37e3-ce20-41da-b0d3-7dfb0fdae9a0).
<a name="declarative_syntax"></a>
## Declarative Syntax
```
<asp:RadioButtonList
AccessKey="string"
AppendDataBoundItems="True|False"
AutoPostBack="True|False"
BackColor="color name|#dddddd"
BorderColor="color name|#dddddd"
BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|
Inset|Outset"
BorderWidth="size"
CausesValidation="True|False"
CellPadding="integer"
CellSpacing="integer"
CssClass="string"
DataMember="string"
DataSource="string"
DataSourceID="string"
DataTextField="string"
DataTextFormatString="string"
DataValueField="string"
Enabled="True|False"
EnableTheming="True|False"
EnableViewState="True|False"
Font-Bold="True|False"
Font-Italic="True|False"
Font-Names="string"
Font-Overline="True|False"
Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|
Large|X-Large|XX-Large"
Font-Strikeout="True|False"
Font-Underline="True|False"
ForeColor="color name|#dddddd"
Height="size"
ID="string"
OnDataBinding="DataBinding event handler"
OnDataBound="DataBound event handler"
OnDisposed="Disposed event handler"
OnInit="Init event handler"
OnLoad="Load event handler"
OnPreRender="PreRender event handler"
OnSelectedIndexChanged="SelectedIndexChanged event handler"
OnTextChanged="TextChanged event handler"
OnUnload="Unload event handler"
RepeatColumns="integer"
RepeatDirection="Horizontal|Vertical"
RepeatLayout="Table|Flow|OrderedList|UnorderedList"
runat="server"
SelectedIndex="integer"
SelectedValue="string"
SkinID="string"
Style="string"
TabIndex="integer"
TextAlign="Left|Right"
ToolTip="string"
ValidationGroup="string"
Visible="True|False"
Width="size"
>
<asp:ListItem
Enabled="True|False"
Selected="True|False"
Text="string"
Value="string"
/>
</asp:RadioButtonList>
```
## Examples
The following code example demonstrates how to programmatically modify the display of a <xref:System.Web.UI.WebControls.RadioButtonList> control.
> [!NOTE]
> The following code example uses the single-file code model and might not work correctly if copied directly into a code-behind file. This code example must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see [ASP.NET Web Forms Page Code Model](https://msdn.microsoft.com/library/81b13e7a-b95b-4285-906f-d2dd77411417).
[!code-aspx-csharp[Classic RadioButtonList Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic RadioButtonList Example/CS/sourcecs.aspx#1)]
[!code-aspx-vb[Classic RadioButtonList Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<altmember cref="T:System.Web.UI.WebControls.ListControl" />
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.RepeatDirection" />
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.RepeatLayout" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
<related type="Article" href="https://msdn.microsoft.com/library/f3e7718f-63d0-44a3-bd5f-48cc2059c2a8">Securing Standard Controls</related>
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public RadioButtonList ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.#ctor" />
<MemberSignature Language="VB.NET" Value="Public Sub New ()" />
<MemberSignature Language="C++ CLI" Value="public:
 RadioButtonList();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Use this constructor to create and initialize a new instance of the <xref:System.Web.UI.WebControls.RadioButtonList> class.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="CellPadding">
<MemberSignature Language="C#" Value="public virtual int CellPadding { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 CellPadding" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.CellPadding" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property CellPadding As Integer" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property int CellPadding { int get(); void set(int value); };" />
<MemberSignature Language="F#" Value="member this.CellPadding : int with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.CellPadding" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>System.ComponentModel.DefaultValue(-1)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1">
<AttributeName>System.ComponentModel.Bindable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the distance (in pixels) between the border and the contents of the table cell.</summary>
<value>The distance (in pixels) between the border and the contents of the table cell. The default is -1, which indicates that this property is not set.</value>
<remarks>
<format type="text/markdown"><]
[!code-aspx-vb[Classic RadioButtonList.CellPadding Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList.CellPadding Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.CellSpacing" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="CellSpacing">
<MemberSignature Language="C#" Value="public virtual int CellSpacing { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 CellSpacing" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.CellSpacing" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property CellSpacing As Integer" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property int CellSpacing { int get(); void set(int value); };" />
<MemberSignature Language="F#" Value="member this.CellSpacing : int with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.CellSpacing" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>System.ComponentModel.DefaultValue(-1)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1">
<AttributeName>System.ComponentModel.Bindable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the distance (in pixels) between adjacent table cells.</summary>
<value>The distance (in pixels) between adjacent table cells. The default is -1, which indicates that this property is not set.</value>
<remarks>
<format type="text/markdown"><]
[!code-aspx-vb[Classic RadioButtonList.CellSpacing Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList.CellSpacing Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.CellPadding" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="CreateControlStyle">
<MemberSignature Language="C#" Value="protected override System.Web.UI.WebControls.Style CreateControlStyle ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig virtual instance class System.Web.UI.WebControls.Style CreateControlStyle() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.CreateControlStyle" />
<MemberSignature Language="VB.NET" Value="Protected Overrides Function CreateControlStyle () As Style" />
<MemberSignature Language="C++ CLI" Value="protected:
 override System::Web::UI::WebControls::Style ^ CreateControlStyle();" />
<MemberSignature Language="F#" Value="override this.CreateControlStyle : unit -> System.Web.UI.WebControls.Style" Usage="radioButtonList.CreateControlStyle " />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Web.UI.WebControls.Style</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Creates a style object that is used internally by the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control to implement all style-related properties.</summary>
<returns>A <see cref="T:System.Web.UI.WebControls.Style" /> that contains the style properties of the control.</returns>
<remarks>
<format type="text/markdown"><]
[!code-aspx-vb[CustomRadioButtonListCreateControlStyle#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/CustomRadioButtonListCreateControlStyle/VB/custom_radiobuttonlist_createcontrolstylevb.aspx#1)]
[!code-csharp[CustomRadioButtonListCreateControlStyle#2](~/samples/snippets/csharp/VS_Snippets_WebNet/CustomRadioButtonListCreateControlStyle/CS/custom_radiobuttonlist_createcontrolstyle.cs#2)]
[!code-vb[CustomRadioButtonListCreateControlStyle#2](~/samples/snippets/visualbasic/VS_Snippets_WebNet/CustomRadioButtonListCreateControlStyle/VB/custom_radiobuttonlist_createcontrolstyle.vb#2)]
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="FindControl">
<MemberSignature Language="C#" Value="protected override System.Web.UI.Control FindControl (string id, int pathOffset);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig virtual instance class System.Web.UI.Control FindControl(string id, int32 pathOffset) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.FindControl(System.String,System.Int32)" />
<MemberSignature Language="VB.NET" Value="Protected Overrides Function FindControl (id As String, pathOffset As Integer) As Control" />
<MemberSignature Language="C++ CLI" Value="protected:
 override System::Web::UI::Control ^ FindControl(System::String ^ id, int pathOffset);" />
<MemberSignature Language="F#" Value="override this.FindControl : string * int -> System.Web.UI.Control" Usage="radioButtonList.FindControl (id, pathOffset)" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Web.UI.Control</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="id" Type="System.String" Index="0" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="pathOffset" Type="System.Int32" Index="1" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
</Parameters>
<Docs>
<param name="id">The identifier for the control to find.</param>
<param name="pathOffset">The number of controls up the page control hierarchy needed to reach a naming container.</param>
<summary>Searches the current naming container for a server control with the specified ID and path offset. The <see cref="M:System.Web.UI.WebControls.RadioButtonList.FindControl(System.String,System.Int32)" /> method always returns the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> object.</summary>
<returns>The current <see cref="T:System.Web.UI.WebControls.RadioButtonList" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.FindControl%2A> method is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
The <xref:System.Web.UI.WebControls.RadioButtonList.FindControl%2A> method overrides the <xref:System.Web.UI.Control.FindControl%2A?displayProperty=nameWithType> method of the base <xref:System.Web.UI.Control> class. You should not override this version of the <xref:System.Web.UI.Control.FindControl%2A?displayProperty=nameWithType> method.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="GetItemStyle">
<MemberSignature Language="C#" Value="protected virtual System.Web.UI.WebControls.Style GetItemStyle (System.Web.UI.WebControls.ListItemType itemType, int repeatIndex);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig newslot virtual instance class System.Web.UI.WebControls.Style GetItemStyle(valuetype System.Web.UI.WebControls.ListItemType itemType, int32 repeatIndex) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.GetItemStyle(System.Web.UI.WebControls.ListItemType,System.Int32)" />
<MemberSignature Language="VB.NET" Value="Protected Overridable Function GetItemStyle (itemType As ListItemType, repeatIndex As Integer) As Style" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual System::Web::UI::WebControls::Style ^ GetItemStyle(System::Web::UI::WebControls::ListItemType itemType, int repeatIndex);" />
<MemberSignature Language="F#" Value="abstract member GetItemStyle : System.Web.UI.WebControls.ListItemType * int -> System.Web.UI.WebControls.Style
override this.GetItemStyle : System.Web.UI.WebControls.ListItemType * int -> System.Web.UI.WebControls.Style" Usage="radioButtonList.GetItemStyle (itemType, repeatIndex)" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Web.UI.WebControls.IRepeatInfoUser.GetItemStyle(System.Web.UI.WebControls.ListItemType,System.Int32)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Web.UI.WebControls.Style</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="itemType" Type="System.Web.UI.WebControls.ListItemType" Index="0" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="repeatIndex" Type="System.Int32" Index="1" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
</Parameters>
<Docs>
<param name="itemType">One of the <see cref="T:System.Web.UI.WebControls.ListItemType" /> enumeration values.</param>
<param name="repeatIndex">An ordinal index that specifies the location of the item in the list control.</param>
<summary>Retrieves the style of the specified item type at the specified index in the list control.</summary>
<returns>
<see langword="null" />, indicating that style attributes are not set on individual list items in a <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.GetItemStyle%2A> method is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
The style attribute for the <xref:System.Web.UI.WebControls.RadioButtonList> control applies to all list items that are contained by the control. Use the <xref:System.Web.UI.WebControls.Style> property of the <xref:System.Web.UI.WebControls.RadioButtonList> control to examine or set the style attribute for the control and its list items.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="HasFooter">
<MemberSignature Language="C#" Value="protected virtual bool HasFooter { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool HasFooter" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.HasFooter" />
<MemberSignature Language="VB.NET" Value="Protected Overridable ReadOnly Property HasFooter As Boolean" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual property bool HasFooter { bool get(); };" />
<MemberSignature Language="F#" Value="member this.HasFooter : bool" Usage="System.Web.UI.WebControls.RadioButtonList.HasFooter" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Web.UI.WebControls.IRepeatInfoUser.HasFooter</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets a value indicating whether the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control contains a footer section.</summary>
<value>
<see langword="false" />, indicating that the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> does not contain a footer section.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.HasFooter%2A> property is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class. Footers are not supported when the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property is set to <xref:System.Web.UI.WebControls.RepeatLayout.UnorderedList> or <xref:System.Web.UI.WebControls.RepeatLayout.OrderedList>.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="HasHeader">
<MemberSignature Language="C#" Value="protected virtual bool HasHeader { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool HasHeader" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.HasHeader" />
<MemberSignature Language="VB.NET" Value="Protected Overridable ReadOnly Property HasHeader As Boolean" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual property bool HasHeader { bool get(); };" />
<MemberSignature Language="F#" Value="member this.HasHeader : bool" Usage="System.Web.UI.WebControls.RadioButtonList.HasHeader" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Web.UI.WebControls.IRepeatInfoUser.HasHeader</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets a value indicating whether the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control contains a heading section.</summary>
<value>
<see langword="false" />, indicating that a <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control does not contain a heading section.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.HasHeader%2A> property is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class. Headers are not supported when the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property is set to <xref:System.Web.UI.WebControls.RepeatLayout.UnorderedList> or <xref:System.Web.UI.WebControls.RepeatLayout.OrderedList>.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="HasSeparators">
<MemberSignature Language="C#" Value="protected virtual bool HasSeparators { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool HasSeparators" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.HasSeparators" />
<MemberSignature Language="VB.NET" Value="Protected Overridable ReadOnly Property HasSeparators As Boolean" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual property bool HasSeparators { bool get(); };" />
<MemberSignature Language="F#" Value="member this.HasSeparators : bool" Usage="System.Web.UI.WebControls.RadioButtonList.HasSeparators" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Web.UI.WebControls.IRepeatInfoUser.HasSeparators</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets a value indicating whether the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control contains separators between items in the list.</summary>
<value>
<see langword="false" />, indicating that a <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control does not contain separators.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.HasSeparators%2A> property is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class. Separators are not supported when the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property is set to <xref:System.Web.UI.WebControls.RepeatLayout.UnorderedList> or <xref:System.Web.UI.WebControls.RepeatLayout.OrderedList>.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="LoadPostData">
<MemberSignature Language="C#" Value="protected virtual bool LoadPostData (string postDataKey, System.Collections.Specialized.NameValueCollection postCollection);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig newslot virtual instance bool LoadPostData(string postDataKey, class System.Collections.Specialized.NameValueCollection postCollection) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)" />
<MemberSignature Language="VB.NET" Value="Protected Overridable Function LoadPostData (postDataKey As String, postCollection As NameValueCollection) As Boolean" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual bool LoadPostData(System::String ^ postDataKey, System::Collections::Specialized::NameValueCollection ^ postCollection);" />
<MemberSignature Language="F#" Value="abstract member LoadPostData : string * System.Collections.Specialized.NameValueCollection -> bool
override this.LoadPostData : string * System.Collections.Specialized.NameValueCollection -> bool" Usage="radioButtonList.LoadPostData (postDataKey, postCollection)" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Web.UI.IPostBackDataHandler.LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="postDataKey" Type="System.String" Index="0" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="postCollection" Type="System.Collections.Specialized.NameValueCollection" Index="1" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
</Parameters>
<Docs>
<param name="postDataKey">The key identifier for the control, used to index the <paramref name="postCollection" />.</param>
<param name="postCollection">A <see cref="T:System.Collections.Specialized.NameValueCollection" /> that contains value information indexed by control identifiers.</param>
<summary>Processes the posted data for the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</summary>
<returns>
<see langword="true" /> if the state of the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> is different from the last posting; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A> method is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
The <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A> method indicates whether the state of the <xref:System.Web.UI.WebControls.RadioButtonList> control has changed. In other words, it determines whether the selected list item in the control is the same as the last posted value. A user changing the selected item in the control changes the <xref:System.Web.UI.WebControls.ListControl.SelectedIndex%2A> value for the <xref:System.Web.UI.WebControls.RadioButtonList> control. If the same list item is selected in the control, or if the <xref:System.Web.UI.WebControls.RadioButtonList> control is disabled, <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A> returns `false`.
When the <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A> method returns `true` for a control, the ASP.NET page framework invokes the <xref:System.Web.UI.WebControls.RadioButtonList.RaisePostDataChangedEvent%2A> method for the control.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="OnInit">
<MemberSignature Language="C#" Value="protected internal override void OnInit (EventArgs e);" />
<MemberSignature Language="ILAsm" Value=".method familyorassemblyhidebysig virtual instance void OnInit(class System.EventArgs e) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.OnInit(System.EventArgs)" />
<MemberSignature Language="VB.NET" Value="Protected Friend Overrides Sub OnInit (e As EventArgs)" />
<MemberSignature Language="C++ CLI" Value="protected public:
 override void OnInit(EventArgs ^ e);" />
<MemberSignature Language="F#" Value="override this.OnInit : EventArgs -> unit" Usage="radioButtonList.OnInit e" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="e" Type="System.EventArgs" Index="0" FrameworkAlternate="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" />
</Parameters>
<Docs>
<param name="e">The event data.</param>
<summary>Raises the <see cref="E:System.Web.UI.Control.Init" /> event.</summary>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="RaisePostDataChangedEvent">
<MemberSignature Language="C#" Value="protected virtual void RaisePostDataChangedEvent ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig newslot virtual instance void RaisePostDataChangedEvent() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.RaisePostDataChangedEvent" />
<MemberSignature Language="VB.NET" Value="Protected Overridable Sub RaisePostDataChangedEvent ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual void RaisePostDataChangedEvent();" />
<MemberSignature Language="F#" Value="abstract member RaisePostDataChangedEvent : unit -> unit
override this.RaisePostDataChangedEvent : unit -> unit" Usage="radioButtonList.RaisePostDataChangedEvent " />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Notifies the ASP.NET application that the state of the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control has changed.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.RaisePostDataChangedEvent%2A> method is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
The ASP.NET page framework calls the <xref:System.Web.UI.WebControls.RadioButtonList.RaisePostDataChangedEvent%2A> method on a <xref:System.Web.UI.WebControls.RadioButtonList> control when the <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A> method indicates that the state of the list items have changed in the <xref:System.Web.UI.WebControls.RadioButtonList> control. The <xref:System.Web.UI.WebControls.RadioButtonList.RaisePostDataChangedEvent%2A> method calls the <xref:System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged%2A> method to raise the <xref:System.Web.UI.WebControls.ListControl.SelectedIndexChanged> event. Control developers can override the <xref:System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged%2A> method to perform custom processing when the user changes the selected item in the control.
The `RaisePostBackEvent` method can optionally perform validation before raising the <xref:System.Web.UI.WebControls.ListControl.SelectedIndexChanged> event for the control. To validate a group of controls on the page when a list item within the <xref:System.Web.UI.WebControls.RadioButtonList> control is selected, set the <xref:System.Web.UI.WebControls.ListControl.AutoPostBack%2A> and <xref:System.Web.UI.WebControls.ListControl.CausesValidation%2A> properties to `true`, and then specify the group of controls to be validated in the <xref:System.Web.UI.WebControls.ListControl.ValidationGroup%2A> property.
]]></format>
</remarks>
<altmember cref="M:System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent" />
<altmember cref="M:System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(System.EventArgs)" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="Render">
<MemberSignature Language="C#" Value="protected internal override void Render (System.Web.UI.HtmlTextWriter writer);" />
<MemberSignature Language="ILAsm" Value=".method familyorassemblyhidebysig virtual instance void Render(class System.Web.UI.HtmlTextWriter writer) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.Render(System.Web.UI.HtmlTextWriter)" />
<MemberSignature Language="VB.NET" Value="Protected Friend Overrides Sub Render (writer As HtmlTextWriter)" />
<MemberSignature Language="C++ CLI" Value="protected public:
 override void Render(System::Web::UI::HtmlTextWriter ^ writer);" />
<MemberSignature Language="F#" Value="override this.Render : System.Web.UI.HtmlTextWriter -> unit" Usage="radioButtonList.Render writer" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="writer" Type="System.Web.UI.HtmlTextWriter" />
</Parameters>
<Docs>
<param name="writer">A <see cref="T:System.Web.UI.HtmlTextWriter" /> that contains the output stream for rendering on the client.</param>
<summary>Displays the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control on the client.</summary>
<remarks>
<format type="text/markdown"><]
[!code-aspx-vb[CustomRadioButtonListRender#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/CustomRadioButtonListRender/VB/custom_radiobuttonlist_rendervb.aspx#1)]
[!code-csharp[CustomRadioButtonListRender#2](~/samples/snippets/csharp/VS_Snippets_WebNet/CustomRadioButtonListRender/CS/custom_radiobuttonlist_render.cs#2)]
[!code-vb[CustomRadioButtonListRender#2](~/samples/snippets/visualbasic/VS_Snippets_WebNet/CustomRadioButtonListRender/VB/custom_radiobuttonlist_render.vb#2)]
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="RenderItem">
<MemberSignature Language="C#" Value="protected virtual void RenderItem (System.Web.UI.WebControls.ListItemType itemType, int repeatIndex, System.Web.UI.WebControls.RepeatInfo repeatInfo, System.Web.UI.HtmlTextWriter writer);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig newslot virtual instance void RenderItem(valuetype System.Web.UI.WebControls.ListItemType itemType, int32 repeatIndex, class System.Web.UI.WebControls.RepeatInfo repeatInfo, class System.Web.UI.HtmlTextWriter writer) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.RenderItem(System.Web.UI.WebControls.ListItemType,System.Int32,System.Web.UI.WebControls.RepeatInfo,System.Web.UI.HtmlTextWriter)" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual void RenderItem(System::Web::UI::WebControls::ListItemType itemType, int repeatIndex, System::Web::UI::WebControls::RepeatInfo ^ repeatInfo, System::Web::UI::HtmlTextWriter ^ writer);" />
<MemberSignature Language="F#" Value="abstract member RenderItem : System.Web.UI.WebControls.ListItemType * int * System.Web.UI.WebControls.RepeatInfo * System.Web.UI.HtmlTextWriter -> unit
override this.RenderItem : System.Web.UI.WebControls.ListItemType * int * System.Web.UI.WebControls.RepeatInfo * System.Web.UI.HtmlTextWriter -> unit" Usage="radioButtonList.RenderItem (itemType, repeatIndex, repeatInfo, writer)" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Web.UI.WebControls.IRepeatInfoUser.RenderItem(System.Web.UI.WebControls.ListItemType,System.Int32,System.Web.UI.WebControls.RepeatInfo,System.Web.UI.HtmlTextWriter)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="itemType" Type="System.Web.UI.WebControls.ListItemType" Index="0" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="repeatIndex" Type="System.Int32" Index="1" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="repeatInfo" Type="System.Web.UI.WebControls.RepeatInfo" Index="2" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
<Parameter Name="writer" Type="System.Web.UI.HtmlTextWriter" Index="3" FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5;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" />
</Parameters>
<Docs>
<param name="itemType">One of the <see cref="T:System.Web.UI.WebControls.ListItemType" /> enumeration values.</param>
<param name="repeatIndex">An ordinal index that specifies the location of the item in the list control.</param>
<param name="repeatInfo">A <see cref="T:System.Web.UI.WebControls.RepeatInfo" /> that represents the information used to render the item in the list.</param>
<param name="writer">A <see cref="T:System.Web.UI.HtmlTextWriter" /> that represents the output stream to render HTML content on the client.</param>
<summary>Renders a list item in the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
The <xref:System.Web.UI.WebControls.RadioButtonList.Render%2A> method implementation for a <xref:System.Web.UI.WebControls.RadioButtonList> control initializes a <xref:System.Web.UI.WebControls.RepeatInfo> object for the list, and calls the <xref:System.Web.UI.WebControls.RepeatInfo.RenderRepeater%2A> method, which in turn uses the <xref:System.Web.UI.WebControls.RadioButtonList.RenderItem%2A> method to render individual radio-button list items.
The <xref:System.Web.UI.WebControls.RadioButtonList.RenderItem%2A> method for a <xref:System.Web.UI.WebControls.RadioButtonList> control ignores the `itemType` and `repeatInfo` parameters. The `repeatIndex` parameter value is used to select the radio button list item in the <xref:System.Web.UI.WebControls.ListControl.Items%2A> collection, and the selected list item is rendered to the output stream.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="RenderWhenDataEmpty">
<MemberSignature Language="C#" Value="public virtual bool RenderWhenDataEmpty { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool RenderWhenDataEmpty" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.RenderWhenDataEmpty" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property RenderWhenDataEmpty As Boolean" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property bool RenderWhenDataEmpty { bool get(); void set(bool value); };" />
<MemberSignature Language="F#" Value="member this.RenderWhenDataEmpty : bool with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.RenderWhenDataEmpty" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="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">
<AttributeName>System.ComponentModel.DefaultValue(false)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="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">
<AttributeName>System.Web.UI.Themeable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets a value that indicates whether the control is rendered if the data source has no data or if the control is not data-bound.</summary>
<value>
<see langword="true" /> if the control is rendered if the data source has no data or if the control is not data-bound; otherwise, <see langword="false" />.</value>
<remarks>To be added.</remarks>
</Docs>
</Member>
<Member MemberName="RepeatColumns">
<MemberSignature Language="C#" Value="public virtual int RepeatColumns { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 RepeatColumns" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.RepeatColumns" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property RepeatColumns As Integer" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property int RepeatColumns { int get(); void set(int value); };" />
<MemberSignature Language="F#" Value="member this.RepeatColumns : int with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.RepeatColumns" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>System.ComponentModel.DefaultValue(0)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1">
<AttributeName>System.ComponentModel.Bindable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the number of columns to display in the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</summary>
<value>The number of columns to display in the <see cref="T:System.Web.UI.WebControls.RadioButtonList" />. The default is 0, which indicates that this property is not set.</value>
<remarks>
<format type="text/markdown"><]
[!code-aspx-vb[Classic RadioButtonList.RepeatColumns Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList.RepeatColumns Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">The number of columns is set to a negative value.</exception>
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.RepeatLayout" />
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.RepeatDirection" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="RepeatDirection">
<MemberSignature Language="C#" Value="public virtual System.Web.UI.WebControls.RepeatDirection RepeatDirection { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance valuetype System.Web.UI.WebControls.RepeatDirection RepeatDirection" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.RepeatDirection" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property RepeatDirection As RepeatDirection" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property System::Web::UI::WebControls::RepeatDirection RepeatDirection { System::Web::UI::WebControls::RepeatDirection get(); void set(System::Web::UI::WebControls::RepeatDirection value); };" />
<MemberSignature Language="F#" Value="member this.RepeatDirection : System.Web.UI.WebControls.RepeatDirection with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.RepeatDirection" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>System.ComponentModel.DefaultValue(Mono.Cecil.CustomAttributeArgument)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1">
<AttributeName>System.ComponentModel.Bindable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Web.UI.WebControls.RepeatDirection</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the direction in which the radio buttons within the group are displayed.</summary>
<value>One of the <see cref="T:System.Web.UI.WebControls.RepeatDirection" /> values. The default is <see langword="Vertical" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Use this property to specify the display direction of the <xref:System.Web.UI.WebControls.RadioButtonList> control.
> [!NOTE]
> The number of columns that are displayed is always determined by the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatColumns%2A> property.
If this property is set to `RepeatDirection.Vertical` and if the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property is set to <xref:System.Web.UI.WebControls.RepeatLayout.Table>, the first column is filled from top to bottom, then the next column, and so on until all items are rendered. For example, if <xref:System.Web.UI.WebControls.RadioButtonList.RepeatColumns%2A> is set to 3, the items of the <xref:System.Web.UI.WebControls.RadioButtonList> control are displayed in three columns. A nine-item list would appear as follows.
||||
|-|-|-|
|1|4|7|
|2|5|8|
|3|6|9|
If this property is set to `RepeatDirection.Horizontal` and if the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property is set to <xref:System.Web.UI.WebControls.RepeatLayout.Table>, the items in the list are displayed in rows loaded left to right, then top to bottom, until all items are rendered. For example, if <xref:System.Web.UI.WebControls.RadioButtonList.RepeatColumns%2A> is set to 3, the items of the <xref:System.Web.UI.WebControls.RadioButtonList> control are displayed in rows of three items. A nine-item list would appear as follows.
||||
|-|-|-|
|1|2|3|
|4|5|6|
|7|8|9|
## Examples
The following code example demonstrates how to use the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatDirection%2A> property to display the items of a <xref:System.Web.UI.WebControls.RadioButtonList> control in columns filled top to bottom, and then left to right.
[!code-aspx-csharp[Classic RadioButtonList.RepeatDirection Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic RadioButtonList.RepeatDirection Example/CS/sourcecs.aspx#1)]
[!code-aspx-vb[Classic RadioButtonList.RepeatDirection Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList.RepeatDirection Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">The display direction of the list is not one of the <see cref="T:System.Web.UI.WebControls.RepeatDirection" /> values.</exception>
<altmember cref="T:System.Web.UI.WebControls.RepeatDirection" />
<altmember cref="P:System.Web.UI.WebControls.RadioButtonList.RepeatColumns" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="RepeatedItemCount">
<MemberSignature Language="C#" Value="protected virtual int RepeatedItemCount { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance int32 RepeatedItemCount" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.RepeatedItemCount" />
<MemberSignature Language="VB.NET" Value="Protected Overridable ReadOnly Property RepeatedItemCount As Integer" />
<MemberSignature Language="C++ CLI" Value="protected:
 virtual property int RepeatedItemCount { int get(); };" />
<MemberSignature Language="F#" Value="member this.RepeatedItemCount : int" Usage="System.Web.UI.WebControls.RadioButtonList.RepeatedItemCount" />
<MemberType>Property</MemberType>
<Implements>
<InterfaceMember>P:System.Web.UI.WebControls.IRepeatInfoUser.RepeatedItemCount</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Int32</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets the number of list items in the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</summary>
<value>The number of items in the list control.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.UI.WebControls.RadioButtonList.RepeatedItemCount%2A> property is used primarily by control developers in custom controls that derive from the <xref:System.Web.UI.WebControls.RadioButtonList> class.
If there are no items set in the <xref:System.Web.UI.WebControls.RadioButtonList> control, the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatedItemCount%2A> property is zero. If there are items set in the <xref:System.Web.UI.WebControls.RadioButtonList> control, the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatedItemCount%2A> property is the same as the <xref:System.Web.UI.WebControls.ListItemCollection.Count%2A?displayProperty=nameWithType> property on the <xref:System.Web.UI.WebControls.ListControl.Items%2A> collection.
]]></format>
</remarks>
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="RepeatLayout">
<MemberSignature Language="C#" Value="public virtual System.Web.UI.WebControls.RepeatLayout RepeatLayout { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance valuetype System.Web.UI.WebControls.RepeatLayout RepeatLayout" />
<MemberSignature Language="DocId" Value="P:System.Web.UI.WebControls.RadioButtonList.RepeatLayout" />
<MemberSignature Language="VB.NET" Value="Public Overridable Property RepeatLayout As RepeatLayout" />
<MemberSignature Language="C++ CLI" Value="public:
 virtual property System::Web::UI::WebControls::RepeatLayout RepeatLayout { System::Web::UI::WebControls::RepeatLayout get(); void set(System::Web::UI::WebControls::RepeatLayout value); };" />
<MemberSignature Language="F#" Value="member this.RepeatLayout : System.Web.UI.WebControls.RepeatLayout with get, set" Usage="System.Web.UI.WebControls.RadioButtonList.RepeatLayout" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName>System.ComponentModel.DefaultValue(Mono.Cecil.CustomAttributeArgument)</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1">
<AttributeName>System.ComponentModel.Bindable(true)</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Web.UI.WebControls.RepeatLayout</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets a value that specifies whether the list will be rendered by using a <see langword="table" /> element, a <see langword="ul" /> element, an <see langword="ol" /> element, or a <see langword="span" /> element.</summary>
<value>A value that specifies whether the list will be rendered by using a <see langword="table" /> element, a <see langword="ul" /> element, an <see langword="ol" /> element, or a <see langword="span" /> element. The default is <see cref="F:System.Web.UI.WebControls.RepeatLayout.Table" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
For information about the available options, see the <xref:System.Web.UI.WebControls.RepeatLayout> enumeration.
> [!NOTE]
> Two options are new as of ASP.NET 4: <xref:System.Web.UI.WebControls.RepeatLayout.OrderedList> and <xref:System.Web.UI.WebControls.RepeatLayout.UnorderedList>.
Some <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> settings do not allow horizontal layout. For more information, see the <xref:System.Web.UI.WebControls.RepeatLayout> enumeration.
## Examples
The following code example demonstrates how to use the <xref:System.Web.UI.WebControls.RadioButtonList.RepeatLayout%2A> property to display the items of a <xref:System.Web.UI.WebControls.RadioButtonList> control in a table.
[!code-aspx-csharp[Classic RadioButtonList.RepeatLayout Example#1](~/samples/snippets/csharp/VS_Snippets_WebNet/Classic RadioButtonList.RepeatLayout Example/CS/sourcecs.aspx#1)]
[!code-aspx-vb[Classic RadioButtonList.RepeatLayout Example#1](~/samples/snippets/visualbasic/VS_Snippets_WebNet/Classic RadioButtonList.RepeatLayout Example/VB/sourcevb.aspx#1)]
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">The radio button layout is not one of the <see cref="T:System.Web.UI.WebControls.RepeatLayout" /> values.</exception>
<altmember cref="T:System.Web.UI.WebControls.RepeatLayout" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
<related type="Article" href="https://msdn.microsoft.com/library/7e3ce9c4-6b7d-4fb1-94b5-72cf2a44fe13">Accessibility in Visual Studio 2010 and ASP.NET 4</related>
</Docs>
</Member>
<Member MemberName="System.Web.UI.IPostBackDataHandler.LoadPostData">
<MemberSignature Language="C#" Value="bool IPostBackDataHandler.LoadPostData (string postDataKey, System.Collections.Specialized.NameValueCollection postCollection);" />
<MemberSignature Language="ILAsm" Value=".method hidebysig newslot virtual instance bool System.Web.UI.IPostBackDataHandler.LoadPostData(string postDataKey, class System.Collections.Specialized.NameValueCollection postCollection) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.UI.WebControls.RadioButtonList.System#Web#UI#IPostBackDataHandler#LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)" />
<MemberSignature Language="VB.NET" Value="Function LoadPostData (postDataKey As String, postCollection As NameValueCollection) As Boolean Implements IPostBackDataHandler.LoadPostData" />
<MemberSignature Language="C++ CLI" Value=" virtual bool System.Web.UI.IPostBackDataHandler.LoadPostData(System::String ^ postDataKey, System::Collections::Specialized::NameValueCollection ^ postCollection) = System::Web::UI::IPostBackDataHandler::LoadPostData;" />
<MemberType>Method</MemberType>
<Implements>
<InterfaceMember>M:System.Web.UI.IPostBackDataHandler.LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)</InterfaceMember>
</Implements>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName>System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="postDataKey" Type="System.String" />
<Parameter Name="postCollection" Type="System.Collections.Specialized.NameValueCollection" />
</Parameters>
<Docs>
<param name="postDataKey">The key identifier for the control, used to index the <paramref name="postCollection" />.</param>
<param name="postCollection">A <see cref="T:System.Collections.Specialized.NameValueCollection" /> that contains value information indexed by control identifiers.</param>
<summary>Processes posted data for the <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control.</summary>
<returns>
<see langword="true" /> if the server control's state changed as a result of the postback; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Typically, you should use the <xref:System.Web.UI.WebControls.RadioButtonList.LoadPostData%2A?displayProperty=nameWithType> method to process posted data for a <xref:System.Web.UI.WebControls.RadioButtonList> control.
The <xref:System.Web.UI.IPostBackDataHandler.LoadPostData%2A?displayProperty=nameWithType> method is an explicit interface member implementation. It can be used only when the <xref:System.Web.UI.WebControls.RadioButtonList> instance is cast to an <xref:System.Web.UI.IPostBackDataHandler> interface.
]]></format>
</remarks>
<block subset="none" type="overrides">
<para>To define a custom implementation for processing posted data for a <see cref="T:System.Web.UI.WebControls.RadioButtonList" /> control, override the <see cref="M:System.Web.UI.WebControls.RadioButtonList.LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)" /> method. The explicit interface implementation calls the <see cref="M:System.Web.UI.WebControls.RadioButtonList.LoadPostData(System.String,System.Collections.Specialized.NameValueCollection)" /> method to process the posted data for the control.</para>
</block>
<altmember cref="T:System.Web.UI.IPostBackDataHandler" />
<related type="Article" href="https://msdn.microsoft.com/library/20eb383c-4b59-432b-bba3-e9d785107747">RadioButton and RadioButtonList Web Server Controls</related>
</Docs>
</Member>
<Member MemberName="System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent">