Question

How can I find the state of NumLock, CapsLock and ScrollLock keys in .NET?

Answer 1

Import the WinAPI function GetKeyState:

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)] public static extern short GetKeyState(int keyCode); 

And then you can use it like this:

bool CapsLock = (((ushort)GetKeyState(0x14)) & 0xffff) != 0; bool NumLock = (((ushort)GetKeyState(0x90)) & 0xffff) != 0; bool ScrollLock = (((ushort)GetKeyState(0x91)) & 0xffff) != 0; 

It is for framework 1.1. For framework 2.0 (and later) you can use:

Control.IsKeyLocked