protected void CB_CheckedChanged(object sender, EventArgs e)
{
CheckBox chk = sender as CheckBox;
//取得当前被选中项的索引
int index = (chk.NamingContainer as DataListItem).ItemIndex;
//取得当前选中项中的某个值，最好找ID。
Label lbl = this.DataListworks.Items[index].FindControl("Labelwid") as Label;
LearnSite.BLL.Works wbll = new LearnSite.BLL.Works();
wbll.CancleScoreWork(Int32.Parse(lbl.Text), chk.Checked);
System.Threading.Thread.Sleep(200);
ShowDoneWorks();
}