How to prevent/cancel a combobox’s value change in c#?

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Save the ComboBox’s SelectedIndex when to box if first entered, and then restore it’s value when you need to cancel the change. 

cbx_Example.Enter += cbx_Example_Enter;
cbx_Example.SelectionChangeCommitted += cbx_Example_SelectionChangeCommitted;

...

private int prevExampleIndex = 0;
private void cbx_Example_Enter(object sender, EventArgs e)
{
    prevExampleIndex = cbx_Example.SelectedIndex;
}

private void cbx_Example_SelectionChangeCommitted(object sender, EventArgs e)
{
    // some custom flag to determine Edit mode
    if (mode == FormModes.EDIT) 
    {
        cbx_Example.SelectedIndex = prevExampleIndex;
    }
}

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