asp.net - C# Can't find reference system.web.ui -


i'm using framework 2.0 , trying build project,but i'm getting lot of errors in aspx.designer.cs pages,example.

protected global::system.web.ui.updatepanel updmenu;

the error says name updatepanel doesn't exist in web.ui namespace,i think because framework doesn't support this?or it't other thing causing this?

in references have system.web,i exlucluded , included multiple times , errors continues.

enter image description here

you must use .net framework 3.5 or upper.

https://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel(v=vs.110).aspx


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