DataColumnCollection.Add Method (DataColumn)
Creates and adds the specified DataColumn object to the DataColumnCollection.
Namespace: System.Data
Assembly: System.Data (in System.Data.dll)
Parameters
- column
- Type: System.Data.DataColumn
The DataColumn to add.
| Exception | Condition |
|---|---|
| ArgumentNullException | The column parameter is null. |
| 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
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.
