private void btnRegisterCourse_Click(object sender, EventArgs e)
 {
     RegisterCourseInterFace register_course_interface = new RegisterCourseInterFace();
     register_course_interface.ShowDialog();
 }
        private void btnRegisterCourse_Click(object sender, EventArgs e)
        {
            RegisterCourseInterFace register_course_interface = new RegisterCourseInterFace();

            register_course_interface.ShowDialog();
        }