private void View_Payment_Details_Load(object sender, EventArgs e)
        {
            List <PaymentsClass> payment = new List <PaymentsClass>();
            Business_Logic       bl      = new Business_Logic();
            //dataGridView1.DataSource = bl.PaymentDetails();
            DataTable dt;

            dt = bl.PaymentDetails();
            foreach (DataRow dr in dt.Rows)
            {
                payment.Add(new PaymentsClass(dr["StudentId"].ToString(), dr["Amount"].ToString(), dr["Date"].ToString()));
                //dataGridView1.DataSource = dt;
            }
            var query = from pay in payment
                        orderby pay.StudentId
                        select pay;

            foreach (PaymentsClass a in query)
            {
                listBox1.Items.Add(a.ToString());
            }
        }