User-1136466523 posted
Hi,
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Are you asking user control (.ascx)? If so, just drag the control in AjaxControlToolKit into the webform of your .ascx page.
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If what you mean is to add the AjaxControlToolkit control into your custom server control, you should add the AjaxControlToolkit.dll into your current web custom
server control library project, create an composite control (make your custom control implement the CompositeControl base class), and initial and create the controls in AjaxControlToolkit.
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Thanks.