绑4定ASP：asp:DropDownList的问题

Question

怎么绑定 ，让DROPDOWNLIST这样：Item两个AB，BC对应的Value为3，4
大侠们请帮忙啊！！！！

Answer 1

<asp:dropdownlist id="ddl" runat="server" AutoPostBack="True">
<asp:ListItem Value="3" Selected="True">AB</asp:ListItem>
<asp:ListItem Value="4">BC</asp:ListItem>
</asp:dropdownlist>

Answer 2

ddl.DataSource = ds;
                ddl.DataValueField = "userid";
                ddl.DataTextField = "username";
                ddl.DataBind();