Winforms: how to open combobox properly?

Question

I have a combobox on the winforms. On Enter even I open it:

cbo.DroppedDown = true;

But if I do that the combo opens and closes immediately

Answer 1

Set DroppedDown = true in GotFocus event of the combobox. Otherwise, the dropdown list will show at wrong location.

void cbo_GotFocus(object sender, EventArgs e)
    {
        ComboBox cbo = sender as ComboBox;
        cbo.DroppedDown = true;
    }