Register ASP.NET Version In IIS

If your IIS Web Service Extensions list is not showing your correct version of ASP.NET, ie It may only show version 1.1.3822 where as your using version 2 in your application, click start > run and then enter this command , replacing the .NET Framework version with your desired version.

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C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe -I