How to Export in Excel

Question

This is my Code 

 

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<div id="page-wrapper" >
         <div class="col-md-12">
  <!-- Form Elements -->
         <div class="panel panel-info">
         <div class="panel-heading">
               <h3 style="text-shadow: 2px 2px #79aed8;">Barcode List </h3>
          </div>
          <div class="panel-body">
          <div id="Barcode">
           <h1 align="center"
                  style="text-decoration: underline; font-size: x-large; font-weight: bold">Barcode</h1>

              <asp:Panel ID="Panel1" runat="server">
                  <asp:Label ID="lblPname" runat="server" Text="" Font-Bold="True"></asp:Label>
                  <br />
                <%--  <asp:PlaceHolder ID="phBarcode" runat="server" Visible="true"></asp:PlaceHolder>
                  </asp:Panel>--%>
                 <asp:Image ID="Image1" runat="server" Height="70px" Width="250px" />
              <div class="table-responsive";>
                 <table class="table">
                    <tbody>
                    <tr>
                    <td>
                        <asp:Button ID="btnPPdf" runat="server" Text="Print" CssClass="btn-info"
                            Width="100px"/>

                         <asp:Button ID="btnExcel" runat="server" Text="Excel" CssClass="btn-success"
                            Width="100px" onclick="btnExcel_Click"  />

                         <asp:Button ID="btnBack" runat="server" Text="Back" CssClass="btn-danger"
                            Height="35px" Width="100px" />
                    </td>
                    </tr>
                    </tbody>
                 </table>
             </div>
          </div>

           </div>
         </div>
      </div>
   </div>
</asp:Content>

I want export to Excel in Content of Inside the Panel  

 

I use this Code this  

 

protected void btnExcel_Click(object sender, EventArgs e)
      {
          Response.Clear();
          Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
          Response.Charset = "";
          Response.ContentType = "application/vnd.xls";
          System.IO.StringWriter stringWrite = new System.IO.StringWriter();
          System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
          Panel1.RenderControl(htmlWrite);
          Response.Write(stringWrite.ToString());
          Response.End();
      }

My output is  

 

 

 

I want that Lable and Image