DataColumn.AllowDBNull Properti

public:
 property bool AllowDBNull { bool get(); void set(bool value); };

public bool AllowDBNull { get; set; }

[System.Data.DataSysDescription("DataColumnAllowNullDescr")]
public bool AllowDBNull { get; set; }

member this.AllowDBNull : bool with get, set

[<System.Data.DataSysDescription("DataColumnAllowNullDescr")>]
member this.AllowDBNull : bool with get, set

Public Property AllowDBNull As Boolean

true jika nilai null diizinkan; jika tidak, false. Default adalah true.

Atribut

DataSysDescriptionAttribute

Contoh berikut membuat baru DataColumn dan mengatur propertinya AllowDBNull ke true.

private void AddNullAllowedColumn()
{
    DataColumn column;
    column = new DataColumn("classID",
        System.Type.GetType("System.Int32"));
    column.AllowDBNull = true;

    // Add the column to a new DataTable.
    DataTable table;
    table = new DataTable();
    table.Columns.Add(column);
}

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

• Unique
• Menggunakan Himpunan Data di ADO.NET