Convert Div Content To Image Using JavaScript in ASP.NET

ASPX

<html>
<head runat="server">
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="http://cdn.rawgit.com/niklasvh/html2canvas/master/dist/html2canvas.min.js"></script>
<script type="text/javascript">
function ConvertToImage(btnExport)
{
debugger;
html2canvas($("#dvTable")[0]).then(function(canvas)
{
debugger;
var base64 = canvas.toDataURL();
$("[id*=hfImageData]").val(base64);
debugger;
__doPostBack(btnExport.name, "");
});
return false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:HiddenField ID="hfImageData" runat="server" ClientIDMode="Static" />
<div id="dvTable" runat="server">
<p>Nikhil</p>
</div>
<asp:Button ID="btnExport" Text="Export to Image" runat="server" UseSubmitBehavior="false" OnClick="ExportToImage" OnClientClick="return ConvertToImage(this)" />
</form>
</body>
</html>

ASPX.CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.IO;
using System.Text;
namespace FACETS
{
public partial class Invoice : System.Web.UI.Page
{
protected void ExportToImage(object sender, EventArgs e)
{
string base64 = Request.Form[hfImageData.UniqueID].Split(',')[1];
byte[] bytes = Convert.FromBase64String(base64);
Response.Clear();
Response.ContentType = "image/png";
Response.AddHeader("Content-Disposition", "attachment; filename=HTML.png");
Response.Buffer = true;
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.BinaryWrite(bytes);
MemoryStream storeStream = new MemoryStream();
MemoryStream ms = new MemoryStream(bytes);
//write to file
FileStream file = new FileStream(Server.MapPath("~/Images/") + "HTML100.png", FileMode.Create,
FileAccess.Write);
ms.WriteTo(file);
file.Close();
ms.Close();
Response.End();
}
}
}