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Asked: 2026-06-12T17:45:54+00:00

The program I am trying to do is to simulate the mouse event of

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The program I am trying to do is to simulate the mouse event of a operating system using keyboard with Windows Form. Right now I am able to change the cursor and do different actions like mouse clicking inside the Form (when the Form is on the Top).

The problem is I would like to extend it to the whole Operating System, which means even if my Windows Form is not at the top, I am still able to control my cursor and do all sorts of mouse event on other applications while the Form is running. How should I do to implement this ?

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  1. Editorial Team

    You can synthesize OS-wide keystrokes, mouse motions, and button clicks using the Win32 SendInput() API. You can call it from C# using P/Invoke. Sample code can be found here: SendInput on PInvoke.net.

    I remember back in the day I used the SendInput (and a screenshot API) to create a Minesweeper bot in C# (2.0 I think). It could solve an Expert puzzle in about one second. I wish I still had the source code to sample here, but I don’t.

    EDIT: It appears someone has already created a nice .NET warpper for the SendInput(): Windows Input Simulator on CodePlex.

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