DataColumnCollection.CollectionChanged Event

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

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

Public Event CollectionChanged As CollectionChangeEventHandler
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)

In JScript, you can handle the events defined by a class, but you cannot define your own.
Not applicable.

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. _

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

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0