private void ScheduleOfCourse_FormClosed(object sender, FormClosedEventArgs e)
{
this.Close();
CoursesForTheSemester s = (CoursesForTheSemester)this.Owner;
s.Show();
}
private void studentCourses_btn(object sender, EventArgs e)
{
this.Hide();
CoursesForTheSemester cfs = new CoursesForTheSemester(this.student, this.connectionString);
cfs.ShowDialog(this);
}