//更新dataGridView
public void Fill()
{
//Display all classes dataGridView ColumnName
var d = CourseManager.AllCourse();
d.Columns[0].ColumnName = "课程ID";
d.Columns[1].ColumnName = "课程名称";
d.Columns[2].ColumnName = "任课教师";
d.Columns[3].ColumnName = "任课教师ID";
d.Columns[4].ColumnName = "大类";
d.Columns[5].ColumnName = "上课时间";
d.Columns[6].ColumnName = "上课地点";
d.Columns[7].ColumnName = "课程容量";
d.Columns[8].ColumnName = "平时成绩比重";
dataGridView1.DataSource = d;
//Display selected classes dataGridView ColumnName
RefreshSelectedClasses();
//Display students' grades in dataGridView
var tab = GradeManager.DisplayStudentGrade(student.Id);
tab.Columns[0].ColumnName = "课程ID";
tab.Columns[1].ColumnName = "课程名称";
tab.Columns[2].ColumnName = "任课教师";
tab.Columns[3].ColumnName = "平时成绩";
tab.Columns[4].ColumnName = "期末成绩";
tab.Columns[5].ColumnName = "总成绩";
dataGridView3.DataSource = tab;
var table = SignManager.DisplaySignList(student.Id);
table.Columns[0].ColumnName = "课程ID";
table.Columns[1].ColumnName = "课程名称";
table.Columns[2].ColumnName = "任课教师ID";
table.Columns[3].ColumnName = "任课教师";
table.Columns[4].ColumnName = "大类";
table.Columns[5].ColumnName = "上课时间";
table.Columns[6].ColumnName = "上课地点";
dataGridView4.DataSource = table;
var Tab = SignManager.IPaddress(student.Id);
Tab.Columns[0].ColumnName = "编号";
Tab.Columns[1].ColumnName = "课程编号";
Tab.Columns[2].ColumnName = "IP地址";
Tab.Columns[3].ColumnName = "签到时间";
Tab.Columns[4].ColumnName = "签到状态";
dataGridView5.DataSource = Tab;
var ta = MessageManager.DisplayTea();
ta.Columns[0].ColumnName = "ID";
ta.Columns[1].ColumnName = "姓名";
ta.Columns[2].ColumnName = "性别";
ta.Columns[3].ColumnName = "部门";
dataGridView10.DataSource = ta;
var datat = MessageManager.DisplayNotice();
datat.Columns[0].ColumnName = "编号";
datat.Columns[1].ColumnName = "标题";
datat.Columns[2].ColumnName = "发布教师";
datat.Columns[3].ColumnName = "发布时间";
dataGridView8.DataSource = datat;
dataGridView6.DataSource = datat;
var tabb = MessageManager.DisplayStuSend(student);
tabb.Columns[0].ColumnName = "编号";
tabb.Columns[1].ColumnName = "教师ID";
tabb.Columns[2].ColumnName = "留言内容";
tabb.Columns[3].ColumnName = "时间";
dataGridView9.DataSource = tabb;
var tta = MessageManager.DisplayStuRece(student);
tta.Columns[0].ColumnName = "编号";
tta.Columns[1].ColumnName = "教师ID";
tta.Columns[2].ColumnName = "留言内容";
tta.Columns[3].ColumnName = "时间";
dataGridView7.DataSource = tta;
}