protected override void OnKeyUp not being called

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C#

I am attempting to catch a keyup event. For some reason using the regular KeyUp event handler is not working in C#. What I am wanting to do is run some code when the Alt key is lifted. I tried using this:

protected override void OnKeyUp(KeyEventArgs e)<br />
{<br />
    base.OnKeyUp(e);<br />
}<br />

and placed a break point on the line of base.OnKeyUp(e) and no matter what was pressed the debugger wouldn't stop there. I have also attempted using an override for about every key event I could find. The only one that had any success was ProcessDialogKey but the only information it gave under keyData was RButton | Shiftkey | Alt which gives no indication whether it was a KeyDown or KeyUp, and I'm not even sure it would work for KeyUp. Any suggestions?

I did further testing on ProcessDialogKey with this:

int x = 0;<br />
protected override bool ProcessDialogKey(Keys keyData)<br />
{<br />
    if (keyData.ToString().Contains("Alt") == true && x == 0)<br />
        x += 1;<br />
    else<br />
x = 2;<br />
    return base.ProcessDialogKey(keyData);<br />
}<br />

and placed the break point on the line of x = 2 to attempt to see if this worked for KeyUp and KeyDown. The debugger did not stop at this line for the KeyUp event but did stop the second time I pushed the Alt key.