Find Controls inside the litsview in asp.net on ItemDataBound

///////////////////////////// html

<asp:ListView runat="server" ID="GV_SWDES"  Style="width: 100%; border-style: none;"

                                                                                data-filter="#filter" ItemPlaceholderID="itemPlaceholder" OnItemDataBound="OnItemDataBound">

                                                                                <LayoutTemplate>

                                                                                    <table border="0" cellpadding="1" class="table table-bordered table-striped table-hover table-responsive dt-responsive nowrap" style="width: 100%; border-style: none; margin: 0px !important;">                                                                                        <tr id="itemPlaceholder" runat="server">                                                                                        </tr>                                                                                    </table>                                                                                </LayoutTemplate>                                                                                <ItemTemplate>

<tr>                                                                                        <td colspan="3" class="text-center p-0">                                                                                            <asp:Label CssClass="lblvattxt" runat="server" ID="lbtn_RFAvg" Text='<%# Bind("AverageRainfall") %>'></asp:Label>                                                                                            <br />                                                                                            <asp:Label runat="server" ID="lbl_RFAvgValue" Text="Average Annual Rainfall"></asp:Label>                                                                                            <asp:HiddenField runat="server" ID="hdn_yeas" Visible="false" Value='<%# Bind("FrToData") %>'/>                                                                                            <asp:Label runat="server" ID="lblRainfallR1" Text="" CssClass=""></asp:Label>                                                                                        </td></tr>

<tr><td class="text-center col-xs-4 p-0">                                                                                            <asp:Label runat="server" ID="lbl_RFKharifValue" Text='<%# Bind("KharifSeason") %>'                                                                                                CssClass="lblvattxt"></asp:Label>  <br />                                                                                            <asp:Label runat="server" ID="lbl_RFKharifDescription" Text="Kharif"></asp:Label>                                                                                        </td>                                                                                        <td class="text-center col-xs-4 p-0">                                                                                            <asp:Label runat="server" ID="lbl_RFRaviValue" Text='<%# Bind("RabiSeason") %>' CssClass="lblvattxt"></asp:Label>                                                                                            <br />                                                                                            <asp:Label runat="server" ID="lbl_RFRaviDescription" Text="Rabi"></asp:Label>                                                                                        </td>                                                                                        <td class="text-center col-xs-4 p-0">                                                                                            <asp:Label runat="server" ID="lbl_RFZaidValue" Text='<%# Bind("ZaidSeason") %>' CssClass="lblvattxt"></asp:Label>                                                                                            <br />                                                                                            <asp:Label runat="server" ID="lbl_RFZaidDescription" Text="Zaid"></asp:Label>                                                                                        </td></tr>                                                                                </ItemTemplate>                                                                                <EmptyDataTemplate>                                                                                    <p class="empt-text-grd m-0">Data not found</p>                                                                                </EmptyDataTemplate>     

</asp:ListView>

/////////////////////// cs

protected void OnItemDataBound(object sender, ListViewItemEventArgs e)

    {      

        if (e.Item.ItemType == ListViewItemType.DataItem)

        {

            Label lb = (e.Item.FindControl("lblRainfallR1") as Label);

             HiddenField hd = (e.Item.FindControl("hdn_yeas") as HiddenField);

                       

            if (lb != null && hd!=null)

            {

                lb.Text = " (" + hd.Value + ")";

            }

        }

    }