public void dest(Int64 pp, string firstname, string lastname, string departured, string rd, string ff, string tf, string v, string op, string tr)
        {
            Airline air = new Airline();

            air.PassportNumber = pp;
            air.FirstName      = firstname;
            air.LastName       = lastname;
            air.depdate        = departured;
            air.returndate     = rd;
            ff = "KARACHI , KHI";
            air.arrivalairport = tf;
            air.via            = v;
            air.ope            = op;
            air.trclass        = tr;
            connec.Open();
            string     query = "insert into ticket values (@ppnumber,@fname,@lname,@Depdate,@returndate, @ff , @rf ,@via , @fo , @travelclass)";
            SqlCommand cmd   = new SqlCommand(query, connec);

            cmd.Parameters.AddWithValue("@ppnumber", air.PassportNumber);
            cmd.Parameters.AddWithValue("@fname", air.FirstName);
            cmd.Parameters.AddWithValue("@lname", air.LastName);
            cmd.Parameters.AddWithValue("@Depdate", air.depdate);
            cmd.Parameters.AddWithValue("@returndate", air.returndate);
            cmd.Parameters.AddWithValue("@ff", ff);
            cmd.Parameters.AddWithValue("@rf", air.arrivalairport);
            cmd.Parameters.AddWithValue("@via", air.via);
            cmd.Parameters.AddWithValue("@fo", air.ope);
            cmd.Parameters.AddWithValue("@travelclass", air.trclass);
            int a = cmd.ExecuteNonQuery();

            if (a > 0)
            {
                MessageBox.Show("Your Ticket has been booked , You can proceed towards hotel booking now .",
                                "Ticket Booked", MessageBoxButtons.OK, MessageBoxIcon.Information);
                air.ShowBill();
                HOTEL ht = new HOTEL();
                ht.Show();
                TICKET tk = new TICKET();
                tk.Hide();
            }
            else
            {
                MessageBox.Show(" Ticket Booking unsuccesful .", "Book Ticket", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            connec.Close();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Airline air = new Airline();

            air.Clear();
        }