click on a button in another application from my C# application?

I want to click on a button in another application from my C# application ,

and I don't have the source code for the application that contains the button

let us开发者_如何学JAVA say as an example ...can I use windows calculator from my application by clicking its buttons Programmatically

I am using c# and .NET

I think I must use windows api to do this

does anybody have any idea????

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Yes, it's not too complicated. You can use FindWindowEx to get the window handle, then iterate through the windows elements and use sendmessage or postmessage to send the WM_Click message.

Here's a codeproject project that does exactly what you want.

Code project