private void label3_Click(object sender, EventArgs e)
        {
            StudentViewCourses svc = new StudentViewCourses();

            this.Hide();
            svc.Show();
        }
        private void StudentsViewCoursespictureBox_Click(object sender, EventArgs e)
        {
            StudentViewCourses svc = new StudentViewCourses();

            this.Hide();
            svc.Show();
        }