title: click on a button in another application from my C# application?
body: <p>I want to click on a button in another application from my C# application ,<br>
  and I don't have the source code for the application that contains the button  </p>
  
  <p>let us say as an example ...can I use windows calculator from my application by clicking its buttons Programmatically<br>
  I am using c# and .NET<br>
  I think I must use windows api to do this<br>
  does anybody have any idea????</p>