asp.net - To show/hide file upload control based on value of hiddenfield in repeater -


i have 1 repeater control on asp.net page. has 1 check box, label, file upload control , 3 hiddenfields. want hide/show file upload control based on value of 1 of hidden fields.

here code snippet itemdatabound event of repeater.

protected void rptchecks_itemdatabound (object sender, repeateritemeventargs e) {      hiddenfield hdid = (hiddenfield)e.item.findcontrol("hdncheckid");     hiddenfield hddocopt = (hiddenfield)e.item.findcontrol("hdndocoption");     fileupload filecheck = (fileupload)e.item.findcontrol("filedocument");      if ( convert.toint32(hddocopt.value) == 0 || convert.toint32(hddocopt.value) == 1)             filecheck.visible = true;         else             filecheck.visible = false; }

here markup code

<asp:repeater id="rptchecks" runat="server"                  onitemdatabound="rptchecks_itemdatabound">                 <headertemplate>                     <table>                         <tr>                             <th>                                 &nbsp;                             </th>                             <th>                                 &nbsp;                             </th>                             <th>                                 &nbsp;                             </th>                         </tr>                 </headertemplate>                 <itemtemplate>                     <tr>                         <td>                             <asp:checkbox id="chk" runat="server" />                         </td>                         <td style="padding-left: 10px">                             <asp:label id="lblcheck" runat="server" text="<%#bind('name') %>"></asp:label>                         </td>                         <td style="padding-left: 10px">                             <asp:hiddenfield id="hdndocoption" runat="server" value="<%#bind('documentoption') %>" />                             <asp:hiddenfield id="hdncheckid" runat="server" value="<%#bind('id') %>" />                             <asp:fileupload id="filedocument" runat="server" />                         </td>                     </tr>                 </itemtemplate>                 <footertemplate>                     </table>                 </footertemplate>             </asp:repeater>

how can this?

error: error occurred object reference not set instance of object @ if-condition.

the error when try find controls in headertemplate , use value, in case value null. should find controls in itemtemplate below:

protected void rptchecks_itemdatabound(object sender, repeateritemeventargs e) {     if (e.item.itemtype == listitemtype.alternatingitem || e.item.itemtype == listitemtype.item)     {         hiddenfield hdid = (hiddenfield)e.item.findcontrol("hdncheckid");          hiddenfield hddocopt = (hiddenfield)e.item.findcontrol("hdndocoption");          fileupload filecheck = (fileupload)e.item.findcontrol("filedocument");          if (convert.toint32(hddocopt.value) == 0 || convert.toint32(hddocopt.value) == 1)             filecheck.visible = true;         else             filecheck.visible = false;     } }

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