Posting WM_KEYDOWN message to externa window in C#

Trying to send a keydown message to separate window. did't find any native C# class to get external windows so i tried to use FindWindow, and SendMessage API functions.
But i can't make it work, looks like the FindWindow method fails, getting diffrent values back each time?
Plz help me!

/B4N WarWulf

I believe the FindWindow/SendMessage method is the way to go here. Maybe if you could post your code, someone would see what you are doing wrong?

Solved the problem, had HWND as ulong instead of uint ;) , thanks anyway.

/B4N WarWulf