ScriptManager' is ambiguous in the namespace 'System.Web.UI'

Question

hi ScriptManager' is ambiguous in the namespace 'System.Web.UI'. how to solve this thanks in advance Regards Rushi

Priya Linge · Answer

Hi 1.You need to remove or comment out the old references to System.Web.Extensions and System.Web.Extensions.Design and add in 3.5 ones in your web.config: --> --> use this assembly=System.Web.Extensions Version=3.5.0.0 Culture=neutral PublicKeyToken=31BF3856AD364E35/> assembly=System.Web.Extensions.Design Version=3.5.0.0 Culture=neutral PublicKeyToken=31BF3856AD364E35/> For more information please check below link. http://weblogs.asp.net/javiervillarreal/archive/2008/01/30/the-type-system-web-ui-scriptmanager-is-ambiguous-it-could-come-from-assembly.aspx Hope this will help you. Thanks.