CanBeNull Property

ColumnAttribute.CanBeNull Property

Gets or sets whether a column can contain null values.

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

'Declaration
Public Property CanBeNull As Boolean
'Usage
Dim instance As ColumnAttribute 
Dim value As Boolean 

value = instance.CanBeNull

instance.CanBeNull = value

Property Value

Type: System.Boolean
Default = true.

If you set this value to false, the data in the corresponding column is assumed to be non-null.

NoteNote:

This property is duplicated from the DbType property for convenience. The CreateDatabase method uses only the DbType property. For this reason, you must specify whether a column can contain null values in the DbType property also.

	<Column(Storage:="_LastName", DbType:="NVarChar(20) NOT NULL", CanBeNull:=false)>  _
	Public Property LastName() As String 
		Get 
			Return Me._LastName
		End Get 
		Set 
			If ((Me._LastName = value)  _
						= false) Then 
				Me.OnLastNameChanging(value)
				Me.SendPropertyChanging
				Me._LastName = value
				Me.SendPropertyChanged("LastName")
				Me.OnLastNameChanged
			End If 
		End Set 
	End Property

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5

Community Additions

ADD
Show:
© 2016 Microsoft