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DataColumnCollection.Add Method (DataColumn)

Creates and adds the specified DataColumn object to the DataColumnCollection.

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

'Declaration
Public Sub Add ( _
	column As DataColumn _
)

Parameters

column
Type: System.Data.DataColumn

The DataColumn to add.

ExceptionCondition
ArgumentNullException

The column parameter is Nothing.

ArgumentException

The column already belongs to this collection, or to another collection.

DuplicateNameException

The collection already has a column with the specified name. (The comparison is not case-sensitive.)

InvalidExpressionException

The expression is invalid. See the Expression property for more information about how to create expressions.

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

The following example adds a DataColumn to a DataColumnCollection.

Private Sub AddDataColumn()
    ' Get the DataColumnCollection from a DataTable in a DataSet. 
    Dim columns As DataColumnCollection = _
        DataSet1.Tables("Orders").Columns

    Dim column As DataColumn = New DataColumn
    With column
       .DataType = System.Type.GetType("System.Decimal")
       .ColumnName = "ItemPrice"
       .Caption = "Price"
       .ReadOnly = False
       .Unique = False
       .DefaultValue = 0
    End With
    columns.Add(column)
End Sub

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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