private void cbbProvince_Click(object sender, EventArgs e)
{
DataSet dataSet = SignUpController.Province_Show();
DataTable dt = new DataTable();
dt = dataSet.Tables[0] as DataTable;
cbbProvince.Items.Clear();
foreach (DataRow dr in dt.Rows)
{
string temp = dr["ProvinceName"].ToString();
cbbProvince.Items.Add(temp);
}
}