What are the methods to determine the .NET Framework version that the application is currently operating on?

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There are several ways to determine the .NET Framework version that an application is currently operating on:

1. Use the Registry Editor: Navigate to the HKEYLOCALMACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP key in the registry editor. Under this key, there will be a set of subkeys with names like v4, v4.5, v4.6, etc. Check the value of the "Release" DWORD in each subkey to determine the corresponding version number.

2. Use the command line: Open a command prompt and run the following command: "dir %WINDIR%\Microsoft.NET\Framework". This will list all the .NET Framework versions installed on the system.

3. Use the .NET Version Detector: This is a third-party tool that can be used to determine the .NET Framework version of an application. Simply run the tool and choose the application whose version needs to be determined.

4. Using the Application Manifest: The application manifest often specifies the .NET Framework version that the application requires. Open the application manifest and search for the line "<supportedruntime version="[version number]"/>". The version number specified here is the .NET Framework version that the application requires.