Export (0) Print
Expand All

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)

public event CollectionChangeEventHandler CollectionChanged
/** @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 void AddEventHandler(DataTable table)
{
    DataColumnCollection columns = table.Columns;
    columns.CollectionChanged += new 
        System.ComponentModel.CollectionChangeEventHandler(
        ColumnsCollection_Changed);

 
private void ColumnsCollection_Changed(object sender, 
    System.ComponentModel.CollectionChangeEventArgs e)
{
    DataColumnCollection columns = 
        (DataColumnCollection) sender;
    Console.WriteLine("ColumnsCollectionChanged: " 
        + columns.Count);


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

Community Additions

ADD
Show:
© 2014 Microsoft