Convert HTML String To PDF Via iTextSharp Library And Download

In this article, we will see how we can convert a string of data to PDF and then send email with attached copy of generated PDF in C#.

Firstly, we can convert the string of data to PDF by using Popular Library for rendering PDF in ItextSharp. Secondly, we can download/save the converted PDF by using HTTP Response Class which provides response to client and contains information about response in the form of headers and other piece of necessary information.

So, lets start to build our first step,

Step 1: Convert HTML String to PDF,

In this step we will first create a button which will do the rest of the work on Click event.

Let's create the button to perform the required operation.

<asp:Button ID="btn_PDFEmail" runat="server" Text="Convert HTML to PDF and Send Email with Attachment" OnClick="btn_PDFEmail_Click" />

The UI view looks like the following:

So our front end is all set and we need to apply the cs logic to perform operation.

Let's start building HTML string. ​​​​​​

StringBuilder sb = new StringBuilder();  
sb.Append("<header class='clearfix'>");  
sb.Append("<h1>INVOICE</h1>");  
sb.Append("<div id='company' class='clearfix'>");  
sb.Append("<div>Company Name</div>");  
sb.Append("<div>455 John Tower,<br /> AZ 85004, US</div>");  
sb.Append("<div>(602) 519-0450</div>");  
sb.Append("<div><a href='mailto:[email protected]'>[email protected]</a></div>");  
sb.Append("</div>");  
sb.Append("<div id='project'>");  
sb.Append("<div><span>PROJECT</span> Website development</div>");  
sb.Append("<div><span>CLIENT</span> John Doe</div>");  
sb.Append("<div><span>ADDRESS</span> 796 Silver Harbour, TX 79273, US</div>");  
sb.Append("<div><span>EMAIL</span> <a href='mailto:[email protected]'>[email protected]</a></div>");  
sb.Append("<div><span>DATE</span> April 13, 2016</div>");  
sb.Append("<div><span>DUE DATE</span> May 13, 2016</div>");  
sb.Append("</div>");  
sb.Append("</header>");  
sb.Append("<main>");  
sb.Append("<table>");  
sb.Append("<thead>");  
sb.Append("<tr>");  
sb.Append("<th class='service'>SERVICE</th>");  
sb.Append("<th class='desc'>DESCRIPTION</th>");  
sb.Append("<th>PRICE</th>");  
sb.Append("<th>QTY</th>");  
sb.Append("<th>TOTAL</th>");  
sb.Append("</tr>");  
sb.Append("</thead>");  
sb.Append("<tbody>");  
sb.Append("<tr>");  
sb.Append("<td class='service'>Design</td>");  
sb.Append("<td class='desc'>Creating a recognizable design solution based on the company's existing visual identity</td>");  
sb.Append("<td class='unit'>$400.00</td>");  
sb.Append("<td class='qty'>2</td>");  
sb.Append("<td class='total'>$800.00</td>");  
sb.Append("</tr>");  
sb.Append("<tr>");  
sb.Append("<td colspan='4'>SUBTOTAL</td>");  
sb.Append("<td class='total'>$800.00</td>");  
sb.Append("</tr>");  
sb.Append("<tr>");  
sb.Append("<td colspan='4'>TAX 25%</td>");  
sb.Append("<td class='total'>$200.00</td>");  
sb.Append("</tr>");  
sb.Append("<tr>");  
sb.Append("<td colspan='4' class='grand total'>GRAND TOTAL</td>");  
sb.Append("<td class='grand total'>$1,000.00</td>");  
sb.Append("</tr>");  
sb.Append("</tbody>");  
sb.Append("</table>");  
sb.Append("<div id='notices'>");  
sb.Append("<div>NOTICE:</div>");  
sb.Append("<div class='notice'>A finance charge of 1.5% will be made on unpaid balances after 30 days.</div>");  
sb.Append("</div>");  
sb.Append("</main>");  
sb.Append("<footer>");  
sb.Append("Invoice was created on a computer and is valid without the signature and seal.");  
sb.Append("</footer>");

I am using StringBuilder class for generating HTML string and pass to the parser for generating PDF. Before proceeding further add the following references.

using iTextSharp.text;  
using iTextSharp.text.html.simpleparser;  
using iTextSharp.text.pdf;  
using System.Configuration;  
using System.IO;  
using System.Linq;  
using System.Net;  
using System.Net.Mail;  
using System.Text;  
using System.Web;

Now let's write the code for generating in-memory PDF from HTML string.

StringReader sr = new StringReader(sb.ToString());    
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);  
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);  
using (MemoryStream memoryStream = new MemoryStream())  
{  
    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memoryStream);  
    pdfDoc.Open();  

    htmlparser.Parse(sr);  
    pdfDoc.Close();  

    byte[] bytes = memoryStream.ToArray();  
    memoryStream.Close();  
}

Now let's understand the Line of code. After building the string we can read from the string as we have passed the generated string.

StringReader sr = new StringReader(sb.ToString());

We are building the PDF document with default page size of A4 Page size.

Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);

Parse the HTML string using HTMLWorker of Itextsharp library,

HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

Use the memory stream to reside the file in-memory.

using (MemoryStream memoryStream = new MemoryStream())  
{  
}