c# - ASP.NET Repeater Control - Getting Hiddenfield value inside the repeater control -

i have hiddenfield inside repeater control , button outside repeater control. below asp.code have.

<asp:repeater id="rptaccordian" runat="server" onitemdatabound="rptaccordian_itemdatabound">    <itemtemplate>      <div class="s_panel">        <h1>            <a href="#" data-content="tool tip"><%# eval("name") %></a>        </h1>        <div>          <p>            <small><span style="font-family: 'segoe ui'; font-weight: bold;">category objective: </span><span style="font-family: 'segoe ui'"><%# eval("objective") %></span></small>          </p>          <p>            <small><span style="font-family: 'segoe ui'; font-weight: bold;">category riskscore: </span>                <code><%# eval("score") %><span>%</span></code></small>          </p>          <p>            <code>                 <img src="content/img/add.png" /><asp:linkbutton id="add" runat="server">add question</asp:linkbutton>            </code>          </p>          <asp:hiddenfield id="hdncategoryid" runat="server" value='<%# bind("categoryid") %>' />        </div>    </itemtemplate>  </asp:repeater>  <div id="modalpopup">    <asp:button id="btninsertquestion" runat="server" text="save" onclick="btninsertquestion_click" />  </div>

my backend code follows.

protected void btninsertquestion_click(object sender, eventargs e) {     hiddenfield hf = (hiddenfield)rptaccordian.findcontrol("hdncategoryid");     catid = convert.toint16(hf.value);     response.write("id is") + catid; } 

there 13 repeaters , each repeater have different categoryid it. have link button called add inside each repeater , when press button have modal popup open , have button. on clicking button need display appropriate categoryid belongs repeater control in clicked add link button.

however, hiddenfield hf showing null , i'm not able value of hiddenfield of accordion.

you have repeater item access hiddenfield:

protected void btninsertquestion_click(object sender, eventargs e)         {               (int = 0; < rptaccordian.items.count; i++)             {                 var item = rptaccordian.items[i];                  var hf = item.findcontrol("hdncategoryid") hiddenfield;                 var val = hf.value;             }         }    

updated

protected void add_click(object sender, eventargs e)         {             var lb = sender linkbutton;             var par = lb.parent.findcontrol("hdncategoryid");          }