Automation testing desktop application tool

Im trying to find a tool to automate testing of our desktop application. I can find all kind of tools for web application but nothing that is useful for windows application. We will have both integretiong and system testing. What we need is that it works on windows program, you can send Soap Request maybe database plugin. The code is c#

Someone of experice can give us a hint of a good tool to start with.

thank you