Install an ASP.NET Assembly into the GAC

To add an assembly to the global assembly cache manually (specifically the ASP.NET AJAX assemply), go to Start > All Programs > Microsoft Visual Studio 2005 > Visual Studio Tools > Visual Studio 2005 Command Prompt. Type the following comman and insert the path/version you have:

>cd C:\Program Files\Microsoft ASP.NET\ASP.NET 2.0 AJAX Extensions\[version number] gacutil -i System.Web.Extensions.dll