private void button1_Click(object sender, EventArgs e)
{
var add = new SubjectAdder();
add.ShowDialog();
subjectTableAdapter.Fill(schoolDataSet.Subject);
schoolDataSet.AcceptChanges();
}
private void button2_Click(object sender, EventArgs e)
{
var cl = new SchoolDataSet.SubjectDataTable();
subjectTableAdapter.FillBy(cl, Convert.ToInt32(dataGridView1.SelectedRows[0].Cells[0].Value));
object[] row = cl.Rows[0].ItemArray;
var edit = new SubjectAdder(Convert.ToInt32(row[0]), Convert.ToString(row[1]));
edit.ShowDialog();
subjectTableAdapter.Fill(schoolDataSet.Subject);
schoolDataSet.AcceptChanges();
}