//定课程列表--学期标识(termTag)
 public void DataBindCourseList(string termTag)
 {
     DalOperationAboutCourses doac = new DalOperationAboutCourses();
     DataSet ds = doac.FindTermCoursesList(termTag);
     dlstCourses.DataSource = ds.Tables[0];
     dlstCourses.DataBind();
 }