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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()

Return Value

Type: System.Data.DataColumn
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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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