Cancel KeyDown Event

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C#

private void MainForm_KeyDown(object sender, KeyEventArgs e)
        {
            try
            {
                switch (e.KeyCode)
                {
                    case Keys.Up:
                        Engine.GearUp();
                        break;

...

While engine.gearup() is working, I need to cancel(or do something else i am not really sure about it) keydown event so user can not be able to press anymore keys until gearup() has done it's work

I tried e.handled and e.SuppressKeyPress and it didnt work for me ..Googled a bit and couldnt find anything..Any help will be appreciated