Fill Combo Box as text is being entered in a Text Box

I have a Text box and a Combo Box on a form.  When the user enters any part of a last name, the combo box gets populated. I want to change this to as the user enters each character in the Text Box, the combo box gets populated as each character is entered in the text box.  I've used the Keypress event but doesn't do what I want.
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You need to use the Key_Down event:

void yourtextBox_KeyDown(object sender, KeyEventArgs e)
            switch (e.KeyCode)
                case Keys.Enter:
                       // your code here


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Isn't there some event like onChange or something for example?
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