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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)

member Add : 
        column:DataColumn -> unit

Parameters

column
Type: System.Data.DataColumn

The DataColumn to add.

ExceptionCondition
ArgumentNullException

The column parameter is a null reference (Nothing in Visual Basic).

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: 4.6, 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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