Get Process owner name from windows C#

Question

I am working on a C# windows application which keeps track of all windows session events on System & record it into Data server. For single user it is ok. But for server like server2003, i want to check if same process with same user is already running then user will get message to log off, because already one session is allocated to his/her id. But i am not able to get process owner name for myapplication.exe from OS. Please suggest what to do.... Thanks :)