private void cbbProvince_SelectedIndexChanged(object sender, EventArgs e)
        {
            string ProvinceNametemp = cbbProvince.SelectedItem.ToString();
            string ProvinceName     = "";

            if (ProvinceNametemp.Contains("Tỉnh"))
            {
                ProvinceName = ProvinceNametemp.Substring(5);
            }
            if (ProvinceNametemp.Contains("Thành Phố"))
            {
                ProvinceName = ProvinceNametemp.Substring(10);
            }
            DataTable dt     = SignUpController.IDProvince_Find(ProvinceName).Tables[0];
            string    IDTemp = dt.Rows[0][0].ToString();
            int       ID     = int.Parse(IDTemp);

            DataTable District = SignUpController.District_Show(ID).Tables[0];

            cbbDistrict.Items.Clear();
            foreach (DataRow dr in District.Rows)
            {
                string temp = dr["DistrictName"].ToString();
                cbbDistrict.Items.Add(temp);
            }
        }