Control when to display something in a projector

[C# Programming]

So for instance, my laptop is connected to a projector via VGA cable, is there a way to control when I want to display the laptop's desktop in the projector? I'm creating an interface in C# wherein if I click a specific button, the projector will display the laptop's desktop. Basically it acts like the Win + P function of windows.

Thank you for any help!