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Server Control - defined in an assembly that is not referenced

Posted By:      Posted Date: September 30, 2010    Points: 0   Category :ASP.Net

I have created a server control for my web page... I have decided to add an ajax popup extender (after creating the control, which builds and works fine.) After I add the AjaxControlToolKit reference I add the following:

private AjaxControlToolkit.PopupControlExtender pop;

I get this error when I add it:

"The type 'System.Web.UI.ExtenderControl' is defined in an assembly that is not referenced.
 You must add a reference to assembly 'System.Web.Extensions, "

I googled the error and it says to add something inside the web config... I do not have a web.config
file inside the server control.

thanks in advance,

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