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ColumnAttribute.UpdateCheck Property

Definition

Namespace:
System.Data.Linq.Mapping
Assembly:
System.Data.Linq.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets how LINQ to SQL approaches the detection of optimistic concurrency conflicts.

public:
 property System::Data::Linq::Mapping::UpdateCheck UpdateCheck { System::Data::Linq::Mapping::UpdateCheck get(); void set(System::Data::Linq::Mapping::UpdateCheck value); };
public System.Data.Linq.Mapping.UpdateCheck UpdateCheck { get; set; }
member this.UpdateCheck : System.Data.Linq.Mapping.UpdateCheck with get, set
Public Property UpdateCheck As UpdateCheck

Property Value

Default = Always, unless IsVersion is true for a member.

Other values are Never and WhenChanged.

Examples

[Column(Storage="_CustomerDesc", DbType="NText", UpdateCheck=UpdateCheck.Never)]
public string CustomerDesc
{
 get
 {
 return this._CustomerDesc;
 }
 set
 {
 if ((this._CustomerDesc != value))
 {
 this.OnCustomerDescChanging(value);
 this.SendPropertyChanging();
 this._CustomerDesc = value;
 this.SendPropertyChanged("CustomerDesc");
 this.OnCustomerDescChanged();
 }
 }
}

<Column(Storage:="_CustomerDesc", DbType:="NText", UpdateCheck:=UpdateCheck.Never)> _
Public Property CustomerDesc() As String
 Get
 Return Me._CustomerDesc
 End Get
 Set
 If ((Me._CustomerDesc = value) _
 = false) Then
 Me.OnCustomerDescChanging(value)
 Me.SendPropertyChanging
 Me._CustomerDesc = value
 Me.SendPropertyChanged("CustomerDesc")
 Me.OnCustomerDescChanged
 End If
 End Set
End Property

Remarks

When this property is used with one of three enums, it determines how LINQ to SQL detects concurrency conflicts.

If no member is designed as IsVersion=true, original member values are compared with the current database state.

The following enums are available:

  • Always Always use this column for conflict detection.

  • Never Never use this column for conflict detection.

  • WhenChanged Use this column only when the member has been changed by the application.

Applies to

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