Starting a process to capture screen when administor users logon by RDP or Console?

Starting a process to capture screen when administor users logon by RDP or
Console?

I am developing a project that capture screen when administor users logon
by RDP or Console.Now I have met a probleam that how to start a process to
capture users' screen when it logon by RDP or Console.Can you give me
help,especially give code examples for c#.Thanks!