本任务是一个学生自行选课系统，可以从表示未选课程的列表框（ListBox）中选择这一学期要修的课程，单击>>命令按钮，将选择的课程放置在表示已选课程的列表框中。反之，可以在已选课程列表中选择课程，通过<<命令按钮，撤销该课程的选择。-This task is a student self-elective system, you can choose courses from that list box is not (ListBox) to select the courses this semester, click the> >　command button to select the courses that have been placed in the selected courses list box. Instead, you can select the selected course curriculum, through the < " Command button to cancel the course selection.