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();
}
}