Download pdf throws error in c#

Hi This is my code :

 

 

StringBuilder sb = new StringBuilder();
sb.Append("

");
sb.Append("

");

sb.Append("" + "" + "");
sb.Append("

(602) 519-0450

");
sb.Append("

[email protected]

");
sb.Append("

");
sb.Append("

");
sb.Append("

PROJECT Website development

");
sb.Append("

CLIENT John Doe

");
sb.Append("

ADDRESS 796 Silver Harbour, TX 79273, US

");
sb.Append("

EMAIL [email protected]

");
sb.Append("

DATE April 13, 2016

");
sb.Append("

DUE DATE May 13, 2016

");
sb.Append("

");
sb.Append("

");
sb.Append("

");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("");
sb.Append("

SERVICE	DESCRIPTION	PRICE	QTY	TOTAL
Design	Creating a recognizable design solution based on the company's existing visual identity	$400.00	2	$800.00
SUBTOTAL				$800.00
TAX 25%				$200.00
GRAND TOTAL				$1,000.00

");
sb.Append("

");
sb.Append("

NOTICE:

");
sb.Append("

A finance charge of 1.5% will be made on unpaid balances after 30 days.

");
sb.Append("

");
sb.Append("

");
sb.Append("");


StringReader sr = new StringReader(sb.ToString());
document.Open();
htmlparser.Parse(sr);
document.NewPage();

}
document.Close();

}


bytes = ms.ToArray();


}

Response.Clear();
//string pdfName = "template";
Response.AddHeader("Content-Disposition", "attachment; filename=" + orderID + "_" + "template" + ".pdf");
Response.ContentType = "application/pdf";
Response.Buffer = true;
Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
Response.BinaryWrite(bytes);
Response.End();
Response.Close(); 

 

 throwing error like :

 

 

 

I added base64 string to the img src in string builder. if i remove image it will works fine.

 Please give me proper solution.

Thanks.