private void button2_Click(object sender, EventArgs e)
        {
            DataRow[] row_update = ds.Tables["Plane"].Select("airline_id = " + aidbox.Text);
        try
        {
            row_update["airline_id"] = int.Parse(aidbox.Text);
            row_update["plane_id"] = int.Parse(pid_box.Text);
            row_update["name"] = name_box.Text;
            row_update["model"] = model_box.Text;
            row_update["f_seats"] = int.Parse(fc_box.Text);
            row_update["s_seats"] = int.Parse(sc_box.Text);
            row_update["b_seats"] = int.Parse(bs_box.Text);
            row_update["p_weight"] = float.Parse(weight_box.Text);
        }
        catch (Exception ex) { MessageBox.Show(ex.Message); }

            try
                {
                    builder = new SqlCommandBuilder(data_adapter);
                    data_adapter.UpdateCommand = builder.GetUpdateCommand();

                    data_adapter.Update(ds, "Plane");

                }
                catch (SqlException ex) { MessageBox.Show(ex.Message); }
            }

        }

DataColumn[] temp = new DataColumn[1];
temp[0] = ds.Tables["Plane"].Columns["airline_id"];
ds.Tables["Plane"].PrimaryKey = temp;
DataRow row_update = ds.Tables["Plane"].Rows.Find(aidbox.Text);