Ajax for Expression Web

If you are using Expression Web for your site in ASP.NET, may be you encounter with one of those problems, it doesnt work with custom controls in the toolbox or custom controls dont display and you get an error like unknown server tag ajaxtoolkit error message !!!
To solve this issue, you have to install the assembly in the GAC by typing this following command in the NET console : gacutil –i nom_assembly.dll
After go to the ajaxcontroltoolkit properties to get the version and the public key token and in the aspx pages, you have to make a reference of both information by using the full name of the tool like :
Assembly=”AjaxControlToolkit, Version=XXXX, Culture=neutral, PublicKeyToken=XXXX”
Namespace=”AjaxControlToolkit”
TagPrefix=”ajaxToolkit”
And now it should work