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HtmlSelect select = (HtmlSelect)FindControl("classID");
ListItem item = new ListItem("我", "i");
ListItem item2 = new ListItem("你", "you");
select.Items.Add(item);
select.Items.Add(item2);
select.SelectedIndex = 2;
//index是插入的位置,比如,1,2,3,value是对应的值
classID.Items.Insert(index,value)