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

If you are actually using .NET framework 4.0 + then then fair enough, however if you are simply moving an existing application from say a Windows Server 2003 box to Windows Server 2012 then you can change the application pool that new site site is running under from .NET Frawework 4.0 to 2.0 and the pipeline mode from Integrated to Classic. New sites on Windows Server 2012 default to .NET 4.0 & Integrated