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c#asp.net.netwebforms.net-2.0

C# Can't find reference system.web.ui

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

protected global::System.Web.UI.UpdatePanel updMenu;

The error says the name UpdatePanel doesn't exist in the web.ui namespace,i think its because the framework doesn't support this?Or it't other thing that is causing this?

In the references i have the system.web,i exlucluded and included multiple times and errors continues.

enter image description here

Solution

  • You must use .Net Framework 3.5 or upper.

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