在后台如何给GridView中的下拉列表赋值啊

数据绑定

如何绑定啊

<InsertItemTemplate>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ChangRequestSystemConnectionString %>"
SelectCommand="SELECT [DepartmentCode], [DepartmentName] FROM [t_Department]"></asp:SqlDataSource>
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource2"
DataTextField="DepartmentName" DataValueField="DepartmentCode" SelectedValue='<%# Bind("DepartmentCode") %>'>
</asp:DropDownList>
</InsertItemTemplate>

下拉框是在编辑列里面的，后面怎么写啊？我访问不到下拉框

http://topic.csdn.net/t/20050518/14/4016486.html