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我在关闭 gridview 后按下按钮时遇到问题，然后代码正在工作，但是当我在 gridview 中按下按钮时发生错误“System.InvalidOperationException：'ModalPopupExtender1'的 TargetControlID 无效。ID 为'btn_edit'的控件找不到。” 我的代码是：

代码

autogeneratecolumns="False" allowpaging="True" PageSize="3" width="500px" ondatabound="CustomersGridView_DataBound"
runat="server" DataKeyNames="CompanyFName" CellPadding="4" ForeColor="#333333" GridLines="None ">

      <AlternatingRowStyle BackColor="White" />

      <Columns>

          <asp:BoundField DataField="CompanyFName" HeaderText="CompanyFName" 
              SortExpression="CompanyFName" />
          <asp:BoundField DataField="CompanySName" HeaderText="CompanySName" 
              SortExpression="CompanySName" />



     <asp:templatefield>


      </Columns>

      <EditRowStyle BackColor="#7C6F57" />
      <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
      <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />

    <pagerstyle forecolor="White"
      backcolor="#666666" HorizontalAlign="Center"/>

    <pagertemplate>

      <table width="100%">                    
        <tr>                        
          <td style="width:70%">

            <asp:label id="MessageLabel"
              forecolor="Blue"
              text="Select a page:" 
              runat="server"/>
            <asp:dropdownlist id="PageDropDownList"
              autopostback="true"
              onselectedindexchanged="PageDropDownList_SelectedIndexChanged" 
              runat="server"/>

          </td>   

          <td style="width:70%; text-align:right">

            <asp:label id="CurrentPageLabel"
              forecolor="Blue"
              runat="server"/>

          </td>

        </tr>                    
      </table>

    </pagertemplate> 

      <RowStyle BackColor="#E3EAEB" />
      <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
      <SortedAscendingCellStyle BackColor="#F8FAFA" />
      <SortedAscendingHeaderStyle BackColor="#246B61" />
      <SortedDescendingCellStyle BackColor="#D4DFE1" />
      <SortedDescendingHeaderStyle BackColor="#15524A" />

  </asp:gridview>
  <asp:AccessDataSource ID="AccessDataSource1" runat="server" 
      DataFile="~/eTimeTrackLite1.mdb" 
      SelectCommand="SELECT  [CompanyFName], [CompanySName] FROM [Companies]">
  </asp:AccessDataSource>
    <asp:Button ID="Button1" runat="server" Text="Button" />

<asp:Panel ID="Panel1" runat="server" BackColor="#990099" Height="146px" 
    Width="403px">
    <asp:Button ID="Button2" runat="server" Text="Button" />
</asp:Panel>
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="btn_edit" PopupControlID="Panel1" CancelControlID="Button2" X="280" Y="220">
 <Animations>
            <OnShowing>
            <FadeIn Duration=".5" Fps="40" />
        </OnShowing>
        <OnShown>
            <FadeIn Duration=".5" Fps="40" />
        </OnShown>
        <%-- neither animation works from code-behind --%>
       <OnHiding>
            <FadeOut Duration=".5" Fps="40" />
        </OnHiding>
        <OnHidden>
            <FadeOut Duration=".5" Fps="40" />
        </OnHidden>

        </Animations>
</asp:ModalPopupExtender>
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