Users can install and run multiple versions of the .NET Framework on their computers. When you develop or deploy your app, you might need to know which .NET Framework versions are installed on the user’s computer.
Note that the .NET Framework consists of two main components, which are versioned separately:
- A set of assemblies, which are collections of types and resources that provide the functionality for your apps. The .NET Framework and assemblies share the same version number.
- The common language runtime (CLR), which manages and executes your app’s code. The CLR is identified by its own version number.
To get an accurate list of the .NET Framework versions installed on a computer, you can view the registry.
To find .NET Framework versions by viewing the registry (.NET Framework 1-4)
- On the Start menu, choose Run.
- In the Open box, enter regedit.exe.
You must have administrative credentials to run regedit.exe.
3. In the Registry Editor, open the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP
The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys.
To find .NET Framework versions by viewing the registry (.NET Framework 4.5 and later)
- On the Start menu, choose Run.
- In the Open box, enter regedit.exe.
You must have administrative credentials to run regedit.exe.
3. In the Registry Editor, open the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\V4\Full
Note that the path to the Full subkey includes the subkey Net Framework rather than .NET Framework.
Check for a DWORD value named Release. The existence of the Release DWORD indicates that the .NET Framework 4.5 or newer has been installed on that computer.
The value of the Release DWORD indicates which version of the .NET Framework is installed.
Source: Microsoft
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