I am truly sorry to hear that you are having bad times with the RadControls for ASP.NET Ajax.
The problem that you are experiencing seems to be caused by the missing Telerik.Web.Design.dll
file. To fix the problem just make sure that you have the Telerik.Web.Desing.dll
in the bin
folder of your project and that the version matches the version of Telerik.Web.UI.dll
. Here is an article from the documentation for RadControls for ASP.NET Ajax that provides detailed information about the Telerik Web Design Assembly
I would suggest you to use the VS Extensions for ASP.NET Ajax when you want to create new project that uses the RadControls, or if you want to add the controls to an existing project. These tasks are easy to perform using the "New Telerik Project" and "Convert to Telerik Project" commands available in the Telerik menu. You can read more about the aid of VS Extensions for ASP.NET Ajax in the Overview
I hope that the provided information was helpful. If you have any further inquiries, please feel free to contact us.
the Telerik team
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