private void cbbDistrict_SelectedIndexChanged(object sender, EventArgs e)
        {
            string DistrictNametemp = cbbDistrict.SelectedItem.ToString();
            string DistrictName     = "";

            if (DistrictNametemp.Contains("Thành Phố"))
            {
                DistrictName = DistrictNametemp.Substring(10);
            }
            if (DistrictNametemp.Contains("Huyện"))
            {
                DistrictName = DistrictNametemp.Substring(6);
            }
            if (DistrictNametemp.Contains("Quận"))
            {
                DistrictName = DistrictNametemp.Substring(5);
            }
            if (DistrictNametemp.Contains("Thị Xã"))
            {
                DistrictName = DistrictNametemp.Substring(7);
            }
            DataTable dt     = SignUpController.IDDistrict_Find(DistrictName).Tables[0];
            string    IDTemp = dt.Rows[0][0].ToString();
            int       ID     = int.Parse(IDTemp);

            DataTable Ward = SignUpController.Ward_Show(ID).Tables[0];

            cbbWard.Items.Clear();
            foreach (DataRow dr in Ward.Rows)
            {
                string temp = dr["WardName"].ToString();
                cbbWard.Items.Add(temp);
            }
        }