C# - NumLock abfragen

using System.Runtime.InteropServices;

[DllImport("user32.dll",EntryPoint="GetKeyState",SetLastError=true)]
public static extern int GetKeyState (int nVirtKey);

private bool NumLock()
{
  if (GetKeyState((int)System.Windows.Forms.Keys.NumLock) != 0)
    return true;
  return false;
}