asp.net - Cannot hide Panel in Grdivew - Object reference not set to an instance of an object -


i trying hide panel in gridview

object reference not set instance of object.

here code using:

protected sub gvtally_rowdatabound(sender object, e system.web.ui.webcontrols.gridviewroweventargs) handles gvtally.rowdatabound      if e.row.cells(2).text = "incomplete"         dim panelhide panel = ctype(e.row.findcontrol("panel1"), panel)         panelhide.visible = false      else         dim panelhide panel = ctype(e.row.findcontrol("panel1"), panel)         panelhide.visible = true     end if end sub

and here gridview:

<asp:gridview id="gvtally" runat="server" enablemodelvalidation="true"                                 allowsorting="true" onrowdatabound="gvtally_rowdatabound" class="table table-condensed table-striped table-bordered table-hover no-margin" autogeneratecolumns="false" font-size="small">                                 <columns>                                     <asp:boundfield datafield="company" headertext="company">                                         <itemstyle width="180px" />                                     </asp:boundfield>                                     <asp:boundfield datafield="submitted" headertext="submitted" />                                     <asp:boundfield datafield="variance" headertext="variance" />                                     <asp:boundfield datafield="accepted" headertext="accepted" />                                     <asp:templatefield headertext="action" showheader="false">                                         <itemtemplate>                                              <asp:button id="button3" runat="server" cssclass="btn btn-warning btn-small" text="unaccept" commandname="unaccept" visible="false" />                                             <asp:button id="button2" runat="server" cssclass="btn btn-success btn-small hidden-phone" text="accept" commandname="accept" />                                             <asp:panel id="panel1" runat="server">                                                 <a href="#accsettings3" role="button" class="btn btn-success btn-small hidden-phone" data-toggle="modal" data-original-title="">accept                         </a>                                                  <div id="accsettings3" class="modal hide fade" tabindex="-3" role="dialog" aria-labelledby="mymodallabel3" aria-hidden="true">                                                     <div class="modal-header">                                                         <button type="button" class="close" data-dismiss="modal" aria-hidden="true">                                                             ×                                                          </button>                                                         <h4 id="mymodallabel3">accept validation                             </h4>                                                     </div>                                                     <div class="modal-body">                                                         <div class="row-fluid">                                                             sure want accept tally variance off?                                                          </div>                                                     </div>                                                     <div class="modal-footer">                                                         <asp:button id="btnacceptchanges" class="btn btn-primary" runat="server" text="yes" />                                                         <button class="btn" data-dismiss="modal" aria-hidden="true">                                                             no                                                          </button>                                                      </div>                                                 </div>                                             </asp:panel>                                              <asp:button id="button1" runat="server" cssclass="btn btn-info btn-small" text="view" commandname="view" />                                             </td>                     </tr>                                          </itemtemplate>                                         <itemstyle width="160px" />                                     </asp:templatefield>                                 </columns>                             </asp:gridview>

i not sure why cannot hide panel contains other html , button control when use findcontrol.

i have other findcontrols work fine, 1 gives me error cannot find panel1.

i using panel hide code inside it.

this has nothing panel.

make sure have data row , not header or something.

if e.row.rowtype = datacontrolrowtype.datarow     ...  end if

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