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DataColumnCollection.Add Method ()

Creates and adds a DataColumn object to the DataColumnCollection.

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

public DataColumn Add ()
public DataColumn Add ()
public function Add () : DataColumn
Not applicable.

Return Value

The newly created DataColumn.

A default name ("Column1", "Column2", and so on) is given to the column.

If the collection is successfully changed by adding or removing columns, the CollectionChanged event occurs.

The following example creates and adds a new DataColumn to the DataColumnCollection of a DataTable.

Private Sub AddColumn()
    ' Get the DataColumnCollection from a table in a DataSet.
    Dim columns As DataColumnCollection = _
        DataSet1.Tables("Prices").Columns
    Dim column As DataColumn = columns.Add()

    With column
       .DataType = System.Type.GetType("System.Decimal")
       .ColumnName = "Total"
       .Expression = "UnitPrice * Quantity"
       .ReadOnly = True
       .Unique = False
    End With
End Sub

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
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