Question

I have a custom installer action that updates the PATH environment, and creates an additional environment variable. Appending a directory to the existing path variable is working fine, but for some reason my attempts to create a new environment variable have been unsuccessful. The code I am using is:

        using (RegistryKey reg = Registry.LocalMachine.OpenSubKey(@'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', true))         {             reg.SetValue('MYVAR', 'SomeVal', RegistryValueKind.ExpandString);         } 

Edit: The OS is 32-bit XP, and as far as I can tell it is failing silently.

Answer 1

Is there any reason that you have to do it through the registry?

If not, you can use Environment.SetEnvironmentVariable() since .NET 2.0. It allows you to set on a machine, process or user basis.