Run my c# application before windows login screen

I believe scheduling your app using windows Task Scheduler in a way where it will run when the computer starts meets your requirement of "run this before windows login screen".

How to schedule a task: http://windows.microsoft.com/en-US/windows7/schedule-a-task[^]

More specifically from that link, what you will want is "To select a schedule based on common recurring events, click When the computer starts or When I log on, and then click Next."

The other way would be to do it using windows services

Creating a Basic Windows Service in C#[^]

So that way the task kicks off when the computer starts. But i would suggest playing around with the task scheduler to do whatever it is you are wanting to do. If i knew more about your requirement there may be other ways to do what you are wanting (Active directory/domain stuffs) but from what i know...this should do what you need.

There are several ways to start a regular application, like from startup script specified in local or domain group policy: http://technet.microsoft.com/en-us/library/cc753404.aspx[^]. But be aware, that something started here won't interact with the user.

An other, much better approach fur such a task is to make a windows service out of your application. Actually this is the way to do it. Start here: http://msdn.microsoft.com/en-us/library/zt39148a(v=vs.100).aspx[^]