值不能爲空。參數名稱：控制

Question

 <cc1:ConfirmButtonExtender DisplayModalPopupID="ModalPopupExtender4" ID="ConfirmButtonExtender4" 
      runat="server" TargetControlID="lnkremoveloc" Enabled="False" OnClientCancel="RemoveLocations"> 
     </cc1:ConfirmButtonExtender> 
     <cc1:ModalPopupExtender ID="ModalPopupExtender4" OkControlID="btnDisable" CancelControlID="btnCancel" 
      BackgroundCssClass="modalBackground" PopupControlID="pnlRemove" TargetControlID="lnkremoveloc" 
      runat="server"> 
     </cc1:ModalPopupExtender> 
     <asp:Panel CssClass="modalPopup" ID="PnlRemove" runat="server"> 
      <!-- Common Popup Control Begin --> 
      <table class="tblCommonPopup" width="400" cellpadding="0" cellspacing="0"> 
       <tr> 
        <td class="topLeft"> 
        </td> 
        <td class="topMiddle"> 
        </td> 
        <td class= "topRight"> 
        </td> 
       </tr> 
       <tr> 
        <td colspan="5" class="middle" align="center"> 
         <!-- Content Area Begin --> 
         <table> 
          <tr> 
           <td colspan="1" style="padding-top: 10px;" title="Select"> 


           </td> 
           <td colspan="4" style="padding-top: 10px;" title="Location Name"> 

           </td> 
          </tr> 
          <tr> 
           <td align="center" colspan="5"> 
            <input id="btnDisable" type="button" value="Disable" class="popupButton" /> 
            <input id="Cancel" type="button" value="Cancel" class="popupButton" /> 
           </td> 
          </tr> 
         </table> 
         <!-- Content Area Ends --> 
        </td> 
       </tr> 
       <tr> 
        <td class="bottomLeft"> 
        </td> 
        <td class="bottomMiddle"> 
        </td> 
        <td class="bottomRight"> 
        </td> 
       </tr> 
      </table> 
      <!-- Common Popup Control End --> 
     </asp:Panel> 

Answer 1

該錯誤表示有一個依賴項屬性具有空值，其中不允許有一個值。不幸的是，您只能粘貼部分代碼，因此我無法確定它屬於哪個屬性 - 請粘貼您的控件的完整代碼。