չDropDownListؼListBoxؼ


ؼʹ
1ַ֧鹦(optgroupǩ)ͨDropDownListؼListBoxؼ.Items.Add(ListItem item)ΪoptgroupǩӶʵַ鹦 
http://www.cnblogs.com/webabcd/archive/2008/01/03/1024977.html
ʹ÷
1)ԣ 
OptionGroupValue - DropDownList(ListBox)ؼķListItemValueֵĬΪoptgroup 
2)ʹDropDownList(ListBox)ؼ.Items.Add(ListItem item) 
OptionGroupValueΪĬֵʱSmartDropDownList.Items.Add(new ListItem("й", "optgroup"));


OK