System.ConsolePal.IsModKey C# (CSharp) Method

        private static bool IsModKey(Interop.InputRecord ir)
        {
            // We should also skip over Shift, Control, and Alt, as well as caps lock.
            // Apparently we don't need to check for 0xA0 through 0xA5, which are keys like 
            // Left Control & Right Control. See the ConsoleKey enum for these values.
            short keyCode = ir.keyEvent.virtualKeyCode;
            return ((keyCode >= 0x10 && keyCode <= 0x12)
                    || keyCode == 0x14 || keyCode == 0x90 || keyCode == 0x91);
        }