ColumnAttribute.UpdateCheck Property

 

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

Namespace:   System.Data.Linq.Mapping
Assembly:  System.Data.Linq (in System.Data.Linq.dll)

Public Property UpdateCheck As UpdateCheck

Property Value

Type: System.Data.Linq.Mapping.UpdateCheck

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

Other values are Never and WhenChanged.

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.

<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

.NET Framework
Available since 3.5
Windows Phone Silverlight
Available since 7.1
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