How to convert HTML to PDF in ASP.NET?

using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;
using System.IO;
using System.Collections;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    // Below code is used to convert your string HTML value to PDF
    protected void btnExportPDF_Click(object sender, EventArgs e)
    {        
        
        //Set page size as A4
        Document pdfDoc = new Document(PageSize.A4, 10, 10, 10, 10);

        try
        {
            PdfWriter.GetInstance(pdfDoc, System.Web.HttpContext.Current.Response.OutputStream);            
            
            //Open PDF Document to write data
            pdfDoc.Open(); 
          
            //Assign Html content in a string to write in PDF
            string contents = "<h5>EXPORT HTML CONTENT TO PDF</h5><br/><br/><b><u>This content is convert from html string to PDF</u></b><br/><br/><br/><font color='red'>Samples from Ravi!!!</font>";
           
            //Read string contents using stream reader and convert html to parsed conent 
            var parsedHtmlElements = HTMLWorker.ParseToList(new StringReader(contents), null);

            //Get each array values from parsed elements and add to the PDF document
            foreach (var htmlElement in parsedHtmlElements)
            pdfDoc.Add(htmlElement as IElement);

            //Close your PDF
            pdfDoc.Close();

            Response.ContentType = "application/pdf";

            //Set default file Name as current datetime
            Response.AddHeader("content-disposition", "attachment; filename=" + DateTime.Now.ToString("yyyyMMdd") + ".pdf");
            System.Web.HttpContext.Current.Response.Write(pdfDoc);

            Response.Flush();
            Response.End();
        }
        catch (Exception ex)
        {
            Response.Write(ex.ToString());
        }
    }

    // Below code is read content from HTML file and convert to PDF 

    protected void Button1_Click(object sender, EventArgs e)
    {
        //Set page size as A4
        Document pdfDoc = new Document(PageSize.A4, 10, 10, 10, 10);

        try
        {
            PdfWriter.GetInstance(pdfDoc, System.Web.HttpContext.Current.Response.OutputStream);

            //Open PDF Document to write data
            pdfDoc.Open();

            //Assign Html content in a string to write in PDF
            string contents = "";

            StreamReader sr;
            try
            {
                //Read file from server path
                sr = File.OpenText(Server.MapPath("sample.html"));
                //store content in the variable
                contents = sr.ReadToEnd();              
                sr.Close();                
            }
            catch (Exception ex)
            {
              
            }

            //Read string contents using stream reader and convert html to parsed conent 
            var parsedHtmlElements = HTMLWorker.ParseToList(new StringReader(contents), null);

            //Get each array values from parsed elements and add to the PDF document
            foreach (var htmlElement in parsedHtmlElements)
            pdfDoc.Add(htmlElement as IElement);

            //Close your PDF
            pdfDoc.Close();

            Response.ContentType = "application/pdf";

            //Set default file Name as current datetime
            Response.AddHeader("content-disposition", "attachment; filename=" + DateTime.Now.ToString("yyyyMMdd") + ".pdf");
            System.Web.HttpContext.Current.Response.Write(pdfDoc);

            Response.Flush();
            Response.End();

        }
        catch (Exception ex)
        {
            Response.Write(ex.ToString());
        }
    }
}