gridview的footerrow放一个dropdownlist 无法取得dropdownlist的值，只能得到控件

实在是不解
                            </asp:TemplateField> <asp:TemplateField HeaderText="权限"  >
                            <EditItemTemplate >
                              <asp:DropDownList ID="ddlPrivilege" runat="server" ></asp:DropDownList>
                            </EditItemTemplate>
                            <ItemTemplate>
                              <asp:Label  Width="60px" ID="LabelPrivilege"  runat="server" Text='<%#Eval("privilege") %>'></asp:Label>
                            </ItemTemplate>
                            <FooterTemplate>
                              <asp:DropDownList ID="ddlfooter" runat="server" ></asp:DropDownList>
                            </FooterTemplate>
                            </asp:TemplateField>


Dim ddlNewPrivilege As DropDownList = UserGridView.FooterRow.FindControl("ddlfooter")
edit的时候editrow的值都可以取得，而且footerrow的其他textbox都正常 --------------------编程问答-------------------- 没人答，自己顶顶

补充：.NET技术 ,  ASP.NET