I created a website with AJAX using VS2005, installed the framework in the production server and the website is working fine.
then I installed VS2008 + Service pack in my computer without uninstalling VS2005, then converted my project to VS2008, with no issues.
then I installed Framework3.5 in the production server without uninstalling Framework2.0. Tested the website and it's good except when I try to run a Crystal report it gave me this error :
Could not load file or assembly 'System.Web.Extensions, Version=220.127.116.11,
Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies.
The located assembly's manifest definition does not match the assembly
reference. (Exception from HRESULT: 0x80131040)
<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtension
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