How to reference the C:\Users\Public directory programmatically in C#

Is it safe to programmatically reference the public folder through:

Directory = System.Environment.GetEnvironmentVariable("public")+"MyCompanyName" // etc.

or is there a better way?

Again, what if someone deletes the environment variable for public, and is this safe to use for different language OSs?

This follows: How to install to the Public directory in Windows 7 from the VS 2010 deployment Setup Project