Method 'get_EnableCdn' in type 'System.Web.UI.ScriptManager' from assembly 'System.Web.Extensions' does not have an implementation

Question

Can anyone explain a parse error like this one:

\"Method \'get_EnableCdn\' in type \'System.Web.UI.ScriptManager\' from assembly \'System.Web.Extensions,

Answer 1

I have seen this error in a web application that was upgraded from a Visual Studio 2005 project to a Visual Studio 2010 project.

The solution was to remove the following section from the web.config file: