C＃Framework 4.5不包含System.Web.Extensions

Question

I try to add System.Web.Extensions in my vs2012 C# desktop application but it give me error. "The type or namespace name 'Extensions' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) " . I already add Ajax toolkit in reference. My application framework is 4.5 full not client reference. Please help me out for this error.

Answer 1

System.Web.Extensions is obsolete in 4.5.

Please see this MSDN link , it describes each member replacement.