use multicombo , asp.net findcontrol后台如何获得listitem选中的值

[jsycjcs]

前台：

<ext:MultiCombo ID="MultiCombo1" runat="server" Width="100" >
                                <Items>
                                    <ext:ListItem Text="北京" Value="00"  />
                                    <ext:ListItem Text="上海" Value="01" />
                                  
                                </Items>
                                <SelectedItems>
                                    <ext:SelectedListItem  Value="00" />
                                    <ext:SelectedListItem Index="01" />
                                </SelectedItems>
                            </ext:MultiCombo>

后台：

foreach (GridViewRow gvr in GridView1.Rows)
        {
                 temp1 = ((MultiCombo)gvr.FindControl("MultiCombo1")).SelectedItems.ToString();
          }