private void add_Rate_Click(object sender, EventArgs e)
{
var add = new PaymentRate();
add.ShowDialog();
paymentRateTableAdapter.Fill(schoolCourseDataSet.PaymentRate);
schoolCourseDataSet.AcceptChanges();
}
private void edit_Rate_Click(object sender, EventArgs e)
{
var ds = new SchoolCourseDataSet.PaymentRateDataTable();
paymentRateTableAdapter.FillBy(ds, Convert.ToInt32(rateDataGridView.SelectedRows[0].Cells[0].Value));
object[] row = ds.Rows[0].ItemArray;
var edt = new PaymentRate(Convert.ToInt32(row[0]),
row[1].ToString(),
Convert.ToInt32(row[2]));
edt.ShowDialog();
paymentRateTableAdapter.Fill(schoolCourseDataSet.PaymentRate);
schoolCourseDataSet.AcceptChanges();
}