DataColumn.AllowDBNull Property

 

Gets or sets a value that indicates whether null values are allowed in this column for rows that belong to the table.

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

Public Property AllowDBNull As Boolean

Property Value

Type: System.Boolean

true if null values values are allowed; otherwise, false. The default is true.

The following example creates a new DataColumn and sets its AllowDBNull property to true.

Private Sub AddNullAllowedColumn()
    Dim column As DataColumn
    column = New DataColumn("classID", _
        System.Type.GetType("System.Int32"))
    column.AllowDBNull = True

    ' Add the column to a new DataTable.
    Dim table As DataTable
    table = New DataTable
    table.Columns.Add(column)
End Sub

.NET Framework
Available since 1.1
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