System.Data Namespace   DataColumnCollection Class

---

Initializes and adds a specified DataColumn object to the columns collection.

[ VB ]
Overloads Public Sub Add ( _
   ByVal column As DataColumn _
)

[ C# ]
public void Add (
   DataColumn column
);

[ C++ ]
public: void Add (
   DataColumn* column
);

[ JScript ]
public function Add (
   column : DataColumn
);

column

The DataColumn to add.

Exception Type	Condition
ArgumentNullException	The column parameter is a null reference.
ArgumentException	The column already belongs to this collection, or to another collection.
DuplicateNameException	The collection already has a column with the same name ( the comparison is not case-sensitive ).
InvalidExpressionException	The expression is invalid. See the Expression property for details on creating expressions.

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

The following example initializes and adds a new DataColumn to the DataColumnCollection of a DataTable using this constructor.

Private Sub AddColumn ( )
   ' get the DataColumnCollection from a table in a DataSet.
   Dim cols As DataColumnCollection = ds.Tables ( "Prices" ).Columns
   Dim myCol As New DataColumn ( )
   With myCol
      .ColumnName = "Total"
      .DataType = System.Type.GetType ( "System.Decimal" )
      .Expression = "UnitPrice * Quantity"
      .ReadOnly = True
      .Unique = False
   End With
   cols.Add ( myCol )
End Sub

DataColumnCollection Members   DataColumnCollection.Add Overload List   DataColumn

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