AJAX Control Toolkit

Source: Internet
Author: User
I used the Ajax Control Toolkit when developing an AJAX-based website today. However, since it was last installed, a dialog box pops up when I dragged the TextBoxWatermarkExtender Control. "Operation failed, invalid FormATETC structure" is displayed ". I think it was because I moved the location of AjaxControlToolkit. dll when I was installing it. I found this problem on the Internet. So I deleted the original AJAX Control Toolkit and re-added AjaxControlToolkit. dll to solve the problem. Write this blog to answer similar questions.
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