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How to Add an AJAX Extender Control?

The ASP.NET AJAX Control Toolkit includes several extender controls that can be used to enhance the client functionality of Web server controls. Before you add an extender control to a server control in the following procedure, you must install the ASP.NET AJAX Toolkit. You can download the Control Toolkit from the “ASP.NET AJAX Control Toolkit” Web site.
1.Switch to Design view.
2.If the page does not already contain a ScriptManager control, from the AJAX Extensions tab of the Toolbox, drag one onto the page.
3.From the Standard tab of the Toolbox, drag a Button control onto the page.
4.If the Common Button Tasks shortcut menu does not appear, right-click the Button control and then click Show Smart Tag.
5.On the Common Button Tasks menu, click Add Extender.
6.In the Extender Wizard, in the Choose the functionality to add to Button1 list, click ConfirmButtonExtender, and then click OK. 
7.In the Properties window, expand the Extenders tab, and then expand Button1_ConfirmButtonExtender.
8.Set the ConfirmText property to Continue?

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