DropDownList 手动添加的 ListItem项目 怎么不显示？（已经绑定数据源）
以下是源码：

<asp:DropDownList ID="XianMing" runat="server" DataSourceID="XianMingSqlData" 

                       DataTextField="xianMing" DataValueField="xianMing" CssClass="XiaLaKuang">

                    <asp:ListItem Text="------请选择------" Value="" Selected="True"></asp:ListItem>

                   </asp:DropDownList>

                   <asp:SqlDataSource ID="XianMingSqlData" runat="server" 

                       ConnectionString="<%$ ConnectionStrings:JianKongConnectionString %>" 

                       SelectCommand="SELECT DISTINCT [xianMing] FROM [XianMing]">

                   </asp:SqlDataSource>

“------请选择------”那一项始终都不显示!!怎样才能显示出来！
------解决方案--------------------

<asp:DropDownList ID="ddlli" runat="server" AutoPostBack="true" AppendDataBoundItems="true">

------解决方案--------------------
 AppendDataBoundItems="true"
------解决方案--------------------
Refer this:
http://www.cnblogs.com/insus/archive/2011/11/17/2252372.html

see also:
http://www.cnblogs.com/insus/archive/2013/01/15/2861536.html
http://www.cnblogs.com/insus/archive/2011/11/08/2241255.html
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