DataColumnCollection.CollectionChanged Event

Occurs when the columns collection changes, either by adding or removing a column.

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

'Declaration
Public Event CollectionChanged As CollectionChangeEventHandler
'Usage
Dim instance As DataColumnCollection
Dim handler As CollectionChangeEventHandler

AddHandler instance.CollectionChanged, handler

/** @event */
public void add_CollectionChanged (CollectionChangeEventHandler value)

/** @event */
public void remove_CollectionChanged (CollectionChangeEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

Use the Contains and CanRemove methods to determine whether a column exists and can be removed.

The following example adds an event handler for the CollectionChanged event.

 Private Sub AddEventHandler(table As DataTable)
     Dim columns As DataColumnCollection = table.Columns
     AddHandler columns.CollectionChanged, _
        AddressOf ColumnsCollection_Changed
 End Sub    
    
 Private Sub ColumnsCollection_Changed _
    (sender As Object, e As System.ComponentModel. _
    CollectionChangeEventArgs)

     Dim columns As DataColumnCollection = _
        CType(sender, DataColumnCollection)
     Console.WriteLine("ColumnsCollectionChanged: " _
        & columns.Count.ToString())
End Sub

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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