Create PDF File in ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
public partial class _Default: Page {
    protected void Page_Load(object sender, EventArgs e) {}
    protected void GenerateReport_Click(object sender, EventArgs e) {
        var doc = new Document(PageSize.A4); // defining the docment
        var output = new MemoryStream();
        var wri = PdfWriter.GetInstance(doc, output);
        var fpara = new Phrase("\n");
        fpara.Add(" * * * * * * You are Welcome * * * * * * ");
        fpara.Add(" \n");
        fpara.Add(" \n");
        string url = "~/Image/kbs.jpg";
        var headerImage = iTextSharp.text.Image.GetInstance(new Uri(Server.MapPath(url)));
        /// Adding border to image if required
        headerImage.Border = iTextSharp.text.Rectangle.BOX;
        headerImage.BorderColor = iTextSharp.text.Color.BLACK;
        headerImage.BorderWidth = 3 f;
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        doc.Open();
        Rectangle defaultPageSize = PageSize.A4;
        BaseFont bfTimes = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, false);
        Font fontH1 = new Font(bfTimes, 9, Font.NORMAL, Color.BLUE);
        PdfPTable table = new PdfPTable(1);
        // You can change the number of columns as per required in our case i think we need only one column
        List < string > paras = new List < string > ();
        foreach(string p1 in paras) {
            PdfPCell cell = new PdfPCell(new Phrase(p1, fontH1));
            //cell.FixedHeight = 15f;
            table.AddCell(cell);
        }
        doc.Add(headerImage);
        /// added header image
        fpara.Add("visit us : kumarbhimsenbgp.blogspot.in");
        fpara.Add("\n");
        doc.Add(fpara); /// added 1
        doc.Add(table); /// added table
        doc.NewPage(); /// aad a new Page when doc item exceed.
        doc.Close(); //Close document
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=KbsTest.pdf");
        Response.BinaryWrite(output.ToArray());
    }
}