How do I allow the user to multi-check with the CheckedListBox through the 'shift' key?

Question

Say that I have a CheckedListBox with items \"1\", \"2\", \"3\", \"4\", and \"5\" in that order and I want to select \"2\", \"3\", and \"4\" by selecting \"2\" then holding

Answer 1

for the multichecks i came up with this today:

    List listBox2_selectionhistory = new List();

    private void checkedListBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        int actualcount = listBox2_selectionhistory.Count;
        if (actualcount == 1)
        {
            if (Control.ModifierKeys == Keys.Shift)
            {
                int lastindex = listBox2_selectionhistory[0];
                int currentindex = checkedListBox2.SelectedIndex;
                int upper = Math.Max(lastindex, currentindex) ;
                int lower = Math.Min(lastindex, currentindex);
                for (int i = lower; i < upper; i++)
                {
                    checkedListBox2.SetItemCheckState(i, CheckState.Checked);
                }
            }
            listBox2_selectionhistory.Clear();
            listBox2_selectionhistory.Add(checkedListBox2.SelectedIndex);
        }
        else
        {
            listBox2_selectionhistory.Clear();
            listBox2_selectionhistory.Add(checkedListBox2.SelectedIndex);
        }
    }

as far as i know checkedlistboxes' SelectionMode can only be either one or none which means you can never make the app select more than 1 at a time (I also used this behavior to simplify my code for checkedlistboxes)