protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string cityID = GridView1.DataKeys[e.RowIndex].Value.ToString();
GridViewRow row = GridView1.Rows[e.RowIndex];
TextBox cityName = (TextBox)row.Cells[1].Controls[0];
TextBox nationalID = (TextBox)row.Cells[2].Controls[0];
GridView1.EditIndex = -1;
//update data
City c = new City();
c.CityID = cityID;
c.CityName = cityName.Text;
c.NationalID = nationalID.Text;
CityDAO.UpdateCity(c);
ShowDataCity();
}
