Registering different versions of .NET Framwework

It’s possible to have more than one ASP.NET IIS installed and registrated on one machine (that runs Windows).
To check which version is currently registered run Command Line (Start/Run… and type ‘cmd’) and go to %SystemRoot%\Microsoft.NET\Framework\vXXX directory where %SystemRoot% is a special system-wide environment variable found on Microsoft Windows NT and its derivatives (read more on Wikipedia) and vXXX is the directory with ASP.NET IIS files.
Being in that directory, type aspnet_regiis -lv. You will be then given the list of installed/registered versions of ASP.NET IIS.

To register a new version of ASP.NET IIS, go to its direcotry in %SystemRoot%\Microsoft.NET\Framework (using Command Line) and run the following command: aspnet_regiis -i.

To unregister a new version of ASP.NET IIS, go to its direcotry in %SystemRoot%\Microsoft.NET\Framework (using Command Line) and run the following command: aspnet_regiis -u.

To learn more about ASP.NET IIS Registration Tool (Aspnet_regiis.exe) visit the description available on MSDN service.

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