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Rule.xml
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Rule.xml
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<Type Name="Rule" FullName="System.Data.Rule">
<TypeSignature Language="C#" Value="public enum Rule" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed Rule extends System.Enum" />
<TypeSignature Language="DocId" Value="T:System.Data.Rule" />
<TypeSignature Language="VB.NET" Value="Public Enum Rule" />
<TypeSignature Language="F#" Value="type Rule = " />
<TypeSignature Language="C++ CLI" Value="public enum class Rule" />
<AssemblyInfo>
<AssemblyName>System.Data</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Data.Common</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Data.Common" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Data.Common" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Data.Common" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Data.Common" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Data.Common" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Enum</BaseTypeName>
</Base>
<Docs>
<summary>Indicates the action that occurs when a <see cref="T:System.Data.ForeignKeyConstraint" /> is enforced.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Data.Rule> values are set to the <xref:System.Data.ForeignKeyConstraint.UpdateRule%2A> and the <xref:System.Data.ForeignKeyConstraint.DeleteRule%2A> properties of a <xref:System.Data.ForeignKeyConstraint> object found in a <xref:System.Data.DataTable> object's <xref:System.Data.ConstraintCollection>.
The <xref:System.Data.Rule> values determine the action that occurs when a value in a column is either deleted or updated. Of the two, deleting a value is the more critical and demanding of attention when setting a rule.
In the case where a value is deleted, `Cascade` specifies that all rows containing that value are also deleted. `SetNull` specifies that values in all child columns are set to null values. `SetDefault` specifies that all child columns be set to the default value for the column. `None` specifies that no action will occur, but exceptions are generated.
In the case where a value is updated, `Cascade` specifies that all child columns are likewise updated with the new value. `SetNull` specifies that all child columns be set to null values. `SetDefault` specifies that all child column values be set to the default value. `None` specifies that no action be taken, but exceptions are generated.
Constraints on a <xref:System.Data.DataSet> are not enforced unless the <xref:System.Data.DataSet.EnforceConstraints%2A> property is `true`.
When the <xref:System.Data.DataTable.AcceptChanges%2A> method is called, the <xref:System.Data.ForeignKeyConstraint.AcceptRejectRule%2A> further determines what action occurs.
## Examples
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_ADO.NET/Classic WebData ForeignKeyConstraint Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="P:System.Data.DataTable.Constraints" />
<altmember cref="T:System.Data.ForeignKeyConstraint" />
</Docs>
<Members>
<Member MemberName="Cascade">
<MemberSignature Language="C#" Value="Cascade" />
<MemberSignature Language="ILAsm" Value=".field public static literal valuetype System.Data.Rule Cascade = int32(1)" />
<MemberSignature Language="DocId" Value="F:System.Data.Rule.Cascade" />
<MemberSignature Language="VB.NET" Value="Cascade" />
<MemberSignature Language="F#" Value="Cascade = 1" Usage="System.Data.Rule.Cascade" />
<MemberSignature Language="C++ CLI" Value="Cascade" />
<MemberType>Field</MemberType>
<AssemblyInfo>
<AssemblyName>System.Data</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Data.Common</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Data.Rule</ReturnType>
</ReturnValue>
<MemberValue>1</MemberValue>
<Docs>
<summary>Delete or update related rows. This is the default.</summary>
</Docs>
</Member>
<Member MemberName="None">
<MemberSignature Language="C#" Value="None" />
<MemberSignature Language="ILAsm" Value=".field public static literal valuetype System.Data.Rule None = int32(0)" />
<MemberSignature Language="DocId" Value="F:System.Data.Rule.None" />
<MemberSignature Language="VB.NET" Value="None" />
<MemberSignature Language="F#" Value="None = 0" Usage="System.Data.Rule.None" />
<MemberSignature Language="C++ CLI" Value="None" />
<MemberType>Field</MemberType>
<AssemblyInfo>
<AssemblyName>System.Data</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Data.Common</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Data.Rule</ReturnType>
</ReturnValue>
<MemberValue>0</MemberValue>
<Docs>
<summary>No action taken on related rows.</summary>
</Docs>
</Member>
<Member MemberName="SetDefault">
<MemberSignature Language="C#" Value="SetDefault" />
<MemberSignature Language="ILAsm" Value=".field public static literal valuetype System.Data.Rule SetDefault = int32(3)" />
<MemberSignature Language="DocId" Value="F:System.Data.Rule.SetDefault" />
<MemberSignature Language="VB.NET" Value="SetDefault" />
<MemberSignature Language="F#" Value="SetDefault = 3" Usage="System.Data.Rule.SetDefault" />
<MemberSignature Language="C++ CLI" Value="SetDefault" />
<MemberType>Field</MemberType>
<AssemblyInfo>
<AssemblyName>System.Data</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Data.Common</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Data.Rule</ReturnType>
</ReturnValue>
<MemberValue>3</MemberValue>
<Docs>
<summary>Set values in related rows to the value contained in the <see cref="P:System.Data.DataColumn.DefaultValue" /> property.</summary>
</Docs>
</Member>
<Member MemberName="SetNull">
<MemberSignature Language="C#" Value="SetNull" />
<MemberSignature Language="ILAsm" Value=".field public static literal valuetype System.Data.Rule SetNull = int32(2)" />
<MemberSignature Language="DocId" Value="F:System.Data.Rule.SetNull" />
<MemberSignature Language="VB.NET" Value="SetNull" />
<MemberSignature Language="F#" Value="SetNull = 2" Usage="System.Data.Rule.SetNull" />
<MemberSignature Language="C++ CLI" Value="SetNull" />
<MemberType>Field</MemberType>
<AssemblyInfo>
<AssemblyName>System.Data</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Data.Common</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Data.Rule</ReturnType>
</ReturnValue>
<MemberValue>2</MemberValue>
<Docs>
<summary>Set values in related rows to <see langword="DBNull" />.</summary>
</Docs>
</Member>
</Members>
</Type>