how to trap enter key??

hi guys. can someone help me with my problem? I'm trying to trap or capture the enter or return key if the user press it on the combo box? Can some one teach me how to trap ernte key or return key on the the combo box..

thanks...

Code:

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private void comboBox1_KeyDown(object sender, KeyEventArgs e)
{
            if (e.KeyCode == Keys.Enter)
            {
                Debug.WriteLine("enter");
            }
}

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but beware when enter key is pressed while the combobox dropdown portion is opened, the key down event will be fired twice.