Auto generate pdf in C# problem

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Web.Security;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;
using iTextSharp.text.html.simpleparser;
using System.Text;

public partial class pdf : System.Web.UI.Page
{
    string Date, ReportTitle;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btn_Click(object sender, EventArgs e)
    {
        lblSubTitle.Text = "nafisa";
        Response.Clear();
        Response.Buffer = true;
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=" + lblSubTitle.Text.Replace(" ", "_").Replace("<br />", "") + "_" + DateTime.Now.Date.ToString("dd-MM-yyyy") + ".pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        //gvReport.AllowPaging = false;
        ////gvReport.DataBind();
        //gvReport.RenderControl(hw);
        ReportTitle = lblSubTitle.Text;
        Date = lblDate.Text;
        // string content = "<div align="center" style="font-family:verdana;font-size:13px"><span style="font-size:13px;">" + ReportTitle + "</span><br /><br /><span style="font-size:8px:font-weight:bold">" + sw.ToString() + "</span></div>";
        string content = "<div align="center" style="font-family:verdana;font-size:13px"><span style="font-size:16px:font-weight:bold;color:Maroon">CARE MEDIQUIP</span><br /><br /><span style="font-size:13px:font-weight:bold">" + ReportTitle + "</span><br /><br /><div align="right" style="font-family:verdana;font-size:11px"><strong>Date :</strong>" + Date + "</div><br />" + sw.ToString() + "</div>";
         Response.Output.Write(content);

        StringReader sr = new StringReader(content);
        Document pdfDoc = new Document(PageSize.A3, 10f, 10f, 10f, 0f);
        HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        // htmlparser.Parse(lblSubTitle.Text);
       htmlparser.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();
    }
}

Server Error in '/Question' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1502: The best overloaded method match for 'iTextSharp.text.html.simpleparser.HTMLWorker.Parse(System.IO.StreamReader)' has some invalid arguments

Source Error:

Line 40:         PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
Line 41:         pdfDoc.Open();
Line 42:         htmlparser.Parse(sr);
Line 43:        
Line 44:         pdfDoc.Close();
Source File: d:\Question\pdffile.aspx.cs    Line: 42

Show Detailed Compiler Output:
Show Complete Compilation Source:
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1