protected void btn_submit_Click(object sender, EventArgs e)
    {
        int i = bl.insert_clg(Convert.ToInt32(drp_city.SelectedValue), txt_clg_code.Text, txt_clg.Text);

        if (i > 0)
        {
            txt_clg.Text      = "";
            txt_clg_code.Text = "";
            databind_clg();
        }
    }