Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. The system cannot find the file specified

Question

I am working on sharepoint 2010. I have created a simple visual web part which contain one text box and I have added calendarextender to it. I have added ajaxcontrolto

Answer 1

Another possible solution is to explicitly set the full assembly name in your register command. I found that I had to update my code to include this to get it to work properly:

<%@ Register Assembly="AjaxControlToolkit, Version=3.0.30930.28736, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

For third-party controls like this, it's worth being as specific as possible to avoid any errors if versions change.