DataColumn.AllowDBNull DataColumn.AllowDBNull DataColumn.AllowDBNull 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.

 property bool AllowDBNull { bool get(); void set(bool value); };
public bool AllowDBNull { get; set; }
member this.AllowDBNull : bool with get, set
Public Property AllowDBNull As Boolean

Property Value

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


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

private void AddNullAllowedColumn()
    DataColumn column;
    column = new DataColumn("classID", 
    column.AllowDBNull = true;

    // Add the column to a new DataTable.
    DataTable table;
    table = new DataTable();
Private Sub AddNullAllowedColumn()
    Dim column As DataColumn
    column = New DataColumn("classID", _
    column.AllowDBNull = True

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

Applies to

See also