public void showList()
        {
            DisplayCoursePresenter displayCoursePresenter = new DisplayCoursePresenter(this);

            dataGridView1.ReadOnly           = true;
            dataGridView1.RowTemplate.Height = 60;
            dataGridView1.DataSource         = displayCoursePresenter.DisplayCourseList();
            dataGridView1.AllowUserToAddRows = false;
        }
        private void buttonFind_Click(object sender, EventArgs e)
        {
            int id = Convert.ToInt32(textBoxID.Text);


            //search student by id

            DisplayCoursePresenter displayPresenter = new DisplayCoursePresenter(this);

            DataTable table = displayPresenter.DisplayCourseById(id);

            if (table.Rows.Count > 0)
            {
                textCourseName.Text   = table.Rows[0]["courseName"].ToString();
                textCourseCode.Text   = table.Rows[0]["courseCode"].ToString();
                textCourseCredit.Text = table.Rows[0]["credit"].ToString();
            }
            else
            {
                MessageBox.Show("This course does not exist!");
            }
        }