private void btnSearchCourse_Click(object sender, EventArgs e)
 {
     SearchCourseInterface search_course_interface = new SearchCourseInterface();
     search_course_interface.ShowDialog();
 }
        private void btnSearchCourse_Click(object sender, EventArgs e)
        {
            SearchCourseInterface search_course_interface = new SearchCourseInterface();

            search_course_interface.ShowDialog();
        }