private void metroButton7_Click(object sender, EventArgs e)
{
p.sPID = Convert.ToInt32(sPID.Text);
bool success = p.Delete(p);
if (success == true)
{
MessageBox.Show("Subject Successfully Deleted.");
}
else
{
MessageBox.Show("error");
}
DataTable dtp = p.Select();
metroGrid2.DataSource = dtp;
Clear2();
}