Circling an object

oh and im using c#

You need to change the view transform. You can create a suitable one using lookatLH which allows you to pass in the camera position and the look at position. Look at position will be the location of the object you wish to circle. Camera position will be based on an angle (you will increment this angle as the arrow key is held down) and a distance from the object you are looking at. Its simple trig/dot products. If you can't do the math to work this out then I would suggest getting a simple trig book or spending some time on mathworld.com - the math only gets harder from this point on with 3d games.