How to prevent the default behaviour of up arrow in a combo box when the DroppedDown=false

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Dear Professionals,

I have a combo box in which, if up arrow is pressed when drop down is closed, I want the focus to move to the previous textbox which I have taken care in the KeyDown event of the combo box control.

Whenever up arrow is pressed, the focus moves to the previous textbox, but the selected item in the combo box changes to its previous item. Can I stop this default behavior ?

Please help. Thanks in advance.
The code to handle KeyDown

C#

private void cbTest_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up)
    {
        if (cbTest.DroppedDown)
            return;
        else
        {
            txtTest.Focus();
        }
    }
}

Posted 1-Feb-15 22:25pm

Priya-Kiko

Updated 1-Feb-15 22:43pm

CHill60

v3

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CHill60 2-Feb-15 4:29am

Post the code you have used to move the focus

Priya-Kiko 2-Feb-15 4:38am

The code to move the focus :

private void cbTest_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Up)
{
if (cbTest.DroppedDown)
return;
else
{
txtTest.Focus();
}
}
}

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CHill60 · Accepted Answer · 2015-02-01T22:45:00

You need to let the KeyDown event know that you don't want to do anything else with that key press.

Try adding e.Handled = true; i.e.

C#

private void cbTest_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up)
    {
        if (cbTest.DroppedDown)
            return;
        else
        {
            txtTest.Focus();
            e.Handled = true;
        }
    }
}