public Pre_Requirement getData(string courseName)
        {
            string          prq1 = "", prq2 = "";
            string          sn  = "SELECT Pre_Requirement_1,Pre_Requirement_2 FROM Curriculum WHERE Course_Name='" + courseName + "'";
            SqlCeCommand    cmd = new SqlCeCommand(sn, con);
            SqlCeDataReader rdr = cmd.ExecuteReader();

            while (rdr.Read())
            {
                prq1 = rdr["Pre_Requirement_1"].ToString();
                prq2 = rdr["Pre_Requirement_2"].ToString();
            }
            con.Close();
            Pre_Requirement pq = new Pre_Requirement(prq1, prq2);

            return(pq);
        }
        private void metroButton1_Click(object sender, EventArgs e)
        {
            DatabaseAccess db = new DatabaseAccess();
            string         courseName, prq1 = "", prq2 = "";

            courseName = textBox1.Text;
            Pre_Requirement pq = db.getData(courseName);

            prq1 = pq.PreReq_1;
            prq2 = pq.PreReq_2;
            listBox1.DataSource = null;
            if (prq1 != null)
            {
                listBox1.Items.Add(prq1);
            }
            if (prq2 != null)
            {
                listBox1.Items.Add(prq2);
            }
        }