http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformssysteminformationclassusernametopic.asp

This is really good too (look at example 2 on the page):

http://www.csharphelp.com/archives/archive63.html


>Using C#, how can I retrieve environmental variables such as Username, etc...?
>
>Thanks,
>
>Jerry