private void btnRemove_Click(object sender, EventArgs e)
        {
            if (lbxCategories.SelectedItems.Count > 0)
            {
                Int32 i32NumSelectedItems = lbxCategories.SelectedItems.Count;
                for (Int32 i32Run = 0; i32Run < i32NumSelectedItems; i32NumSelectedItems++)
                {
                    lbxCategories.Items.RemoveAt(lbxCategories.Items.IndexOf(lbxCategories.SelectedItems[0]));
                }
            }
        }