private void addToolStripMenuItem_Click(object sender, EventArgs e)
{
var add = new ClassAdder();
add.ShowDialog();
classTableAdapter.Fill(schoolDataSet.Class);
schoolDataSet.AcceptChanges();
}
private void updateToolStripMenuItem1_Click(object sender, EventArgs e)
{
var cl = new SchoolDataSet.ClassDataTable();
classTableAdapter.FillBy(cl, Convert.ToInt32(dataGridView1.SelectedRows[0].Cells[0].Value));
object[] row = cl.Rows[0].ItemArray;
var edit = new ClassAdder(Convert.ToInt32(row[0]), Convert.ToChar(row[1]), Convert.ToDateTime(row[2]));
edit.ShowDialog();
classTableAdapter.Fill(schoolDataSet.Class);
schoolDataSet.AcceptChanges();
}