Csharp iTextSharp create pdf file

/*
 //http://sourceforge.net/projects/itextsharp/
 * http://stackoverflow.com/questions/8713963/itextsharp-pdf-resize-document-to-accomodate-a-large-image
 * http://www.inliteresearch.com/barcode-recognition/
 * http://footheory.com/blogs/donnfelker/archive/2008/05/11/using-itextsharp-to-watermark-write-text-to-existing-pdf-s.aspx
 * http://redaction.codeplex.com/
 * http://www.koders.com/csharp/fidB1D68577734B615DBC366542FF8BA8A977F7F54D.aspx?s=button
 */

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
//using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.xml;
using iTextSharp.text.exceptions;
using System.Drawing.Imaging;
using iTextSharp;
using DataMatrix.net;

namespace WindowsWordDemo
{
    public partial class FormPdf : Form
    {

        private static string path = Directory.GetCurrentDirectory();
        string imagePath=path+"\\geovindu.png";
        string strFileName = path + "\\geovindu.pdf";
        Document doc = new Document(PageSize.A4.Rotate());//LETTER.Rotate()

        // ---------------------------------------------------------------
        // Date      180310
        // Purpose   Text to DataMatrix image.
        // Entry     sFileName - Name of the barcode file (PNG, + path).
        //           sValue - The string to save as barcode.
        //           iBitSize - The size of one data bit (pixels).
        //           iBorSize - The size of the quiet zone (pixels).
        // Return    The bitmap, null if not successful.
        // Comments  Supports .bmp, .gif, .ico, .jpg, .png, .wdp, .tiff.
        //           See source, project DataMatrixTest, Program.cs.
        //http://wrb.home.xs4all.nl/Articles_2010/Article_WPFDataMatrix_P2_01.htm
        // ---------------------------------------------------------------
        private System.Drawing.Bitmap EncodeText(string sFileName, string sValue,
                                                  int iBitSize, int iBorSize)
        {
            DmtxImageEncoder encoder = new DmtxImageEncoder();

            DmtxImageEncoderOptions options = new DmtxImageEncoderOptions();
            options.ModuleSize = iBitSize;
            options.MarginSize = iBorSize;
            options.BackColor = System.Drawing.Color.White;
            options.ForeColor = System.Drawing.Color.Black;

            // With options (GDI+).
            System.Drawing.Bitmap oB = encoder.EncodeImage(sValue, options);

            // Without options.
            // System.Drawing.Bitmap encodedBitmap = encoder.EncodeImage(sValue);

            try
            {
                oB.Save(sFileName, System.Drawing.Imaging.ImageFormat.Png);
            }
            catch
            {
                oB = null;
            }
            return oB;
        }
        /// <summary>
        /// 
        /// </summary>
        public FormPdf()
        {
            InitializeComponent();
            
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FormPdf_Load(object sender, EventArgs e)
        {
            //var doc1 = new Document(PageSize.A4, 50, 50, 80, 50);
            //MemoryStream Memory = new MemoryStream();
            //PdfWriter pdfWrite = PdfWriter.GetInstance(doc1, Memory);
            //20120603 Geovin Du
            //塗聚文
            
            try
            {
                //條形碼碼圖片
                EncodeText(imagePath, "36242520120603", 100, 100);


                PdfWriter.GetInstance(doc, new FileStream(strFileName, FileMode.Create));
                doc.Open();
                doc.Add(new Paragraph());
                iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(imagePath);
                if (img.Height > img.Width)
                {
                    //Maximum height is 800 pixels.
                    float percentage = 0.0f;
                    percentage = 700 / img.Height;
                    img.ScalePercent(percentage * 100);
                }
                else
                {
                    //Maximum width is 600 pixels.
                    float percentage = 0.0f;
                    percentage = 540 / img.Width;
                    img.ScalePercent(percentage * 100);
                }
                img.SetAbsolutePosition(10, 10);
                img.Border = iTextSharp.text.Rectangle.BOX;
                img.BorderColor = iTextSharp.text.Color.BLACK;
                img.BorderWidth = 3f;
                
                doc.Add(img);
                doc.NewPage();
                BaseFont btfChinese=BaseFont.CreateFont(@"D:\WINDOWS\Fonts\繁篆书.ttf", BaseFont.IDENTITY_H,BaseFont.NOT_EMBEDDED);
                Font ChFont=new Font(btfChinese,12);
                Font ChFont_blue = new Font(btfChinese, 40, 3, iTextSharp.text.Color.BLUE);
                Font ChFont_message = new Font(btfChinese, 60, 5, iTextSharp.text.Color.RED);
                doc.Add(new Paragraph("First Pdf File made by Salman using iText,涂斯博", ChFont_blue));
                doc.NewPage();
                Chunk c = new Chunk("￡捡垃圾,就是我的一生渴求. ￡并且喜欢这句『书中自有黄金屋,书中自有颜如玉,书中自有千钟黍,书中车马多簇簇』的感慨.『读书长见识,行路广阅历』,是一个「悟」字. ＄自然是我最想追求的「偶像」. ￥读者是,读之者,者之读.一沙一世界! ￥to be is to do举世皆清我独浊,众人皆醒我独醉website:http://www.dusystem.com , www.geovi.com,www.dupcit.com ",ChFont);
                Phrase p1 = new Phrase(c);
                doc.Add(p1);
                Chunk c1 = new Chunk("近期心愿	有饭吃,有觉睡", ChFont);
                Chunk c2 = new Chunk("哲学管理(学)人生, 文学艺术生活, 自动(计算机学)物理(学)工作, 生物(学)化学逆境, 历史(学)测绘(学)时间, 经济(学)数学金钱(理财), 心理(学)医学情绪, 诗词美容情感, 美学建筑(学)家园, 解构(分析)整合学习, 情商(EQ)运筹(学)成功,信息流,物流,人力资源流,资本流的系统解决方案的开发与设计.", ChFont_blue);
                Chunk c3 = new Chunk("why we only heard about haves and have-nots,why we didn't heard about doers and doer-nots.人生是一种心境,生活是一种艺术,成功是一种心态,幸福是一种感觉,竞争是一种建构,情感是一种整合.学习是一种成长.逻辑和美都关注封闭的事实,我们的生活则是发现的经验中度过的.....$经一番挫折,长一番识见.容一番横逆,增一番器度.省一番经营,多一分道义.学一分退让,讨一分便宜.去一分奢侈,少一分罪过.加一分体贴,知一分物情.", ChFont);
                Phrase p2 = new Phrase();
                p2.Add(c1);
                p2.Add(c2);
                p2.Add(c3);
                Paragraph pg = new Paragraph(p2);
                pg.SetAlignment("Justify");
                pg.FirstLineIndent = 20f;
                pg.SetLeading(0.0f, 2.0f);
                doc.Add(pg);
                doc.Close();

            }
            catch
            {
                // add some code here incase you have an exception
            }
            finally
            {
                //Free the instance of the created doc as well
                doc.Close();
            }

        }
}
}

            //A4紙：页面宽度 827* 1169 (英寸)，210*297(毫米)
            //自定義紙張大小 PaperSize   pkCustomSize   =   new   PaperSize( "custom   size",(int)(82.55*100/25.4+1),(int)(184.0*100/25.4+1)); //毫米轉英寸

 流显示出来

            try
            { 
                String OUT_FOLDER =Server.MapPath("/pdf/");
                string RESOURCES = Server.MapPath("/Font/");
                String filename = OUT_FOLDER + "geovindu.pdf";
                //1 流读取
                MemoryStream m = new MemoryStream();

                //2 保存PDF文件
               // FileStream fos = new FileStream(filename, FileMode.Create);

                Document document = new Document();
                //必须加上，否则中文显示不上
                Response.Charset = "utf-8";
                Response.ContentType = "application/pdf";
                //1 流写入
                PdfWriter writer = PdfWriter.GetInstance(document, m);

                //2 写入文件
               // PdfWriter writer = PdfWriter.GetInstance(document, fos);

                writer.CreateXmpMetadata();
                document.Open();

                Font font = FontFactory.GetFont(RESOURCES + "钟齐翰墨毛笔.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED, 18);//BaseFont.WINANSI, BaseFont.EMBEDDED
                document.Add(new Paragraph("Hello World，中国人民站起来了--涂聚文(Geovin Du)曰", font));

                iTextSharp.text.pdf.PdfPTable table = new PdfPTable(2);
                table.SpacingBefore = 18f; //与上一个元素的距离
                table.TotalWidth = 616f;
                int[] cellwidht = { 180, 180 };
                table.SetWidths(cellwidht);

                PdfPCell cell ;
                cell = new PdfPCell(new Phrase("天下为公",font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);
                cell = new PdfPCell(new Phrase("涂聚文", font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);
                cell = new PdfPCell(new Phrase("公正，公平，公开", font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);
                cell = new PdfPCell(new Phrase("Geovin Du", font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);
                cell = new PdfPCell(new Phrase("深圳市", font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);
                cell = new PdfPCell(new Phrase("罗湖区", font));
                cell.Top = 5f;
                cell.HorizontalAlignment = Element.ALIGN_CENTER;
                table.AddCell(cell);

                document.Add(table);
              
                document.Close();
          
                //PdfReader reader = new PdfReader(filename);
                //bool exceptionThrown = false;
                //try
                //{
                //    FileStream stamperFileStream = new FileStream(OUT_FOLDER + "geovindu1.pdf", FileMode.Create);
                //    PdfAStamper stamper = new PdfAStamper(reader, stamperFileStream, PdfAConformanceLevel.PDF_A_1A);
                //    stamper.Close();
                //    stamperFileStream.Close();
                
                //}
                //catch (PdfAConformanceException)
                //{
                //    exceptionThrown = true;
                //    fos.Close();
                //}
                //reader.Close();
              //  fos.Close();
                writer.Close();
                document = null;
                writer = null;

               // Response.Write("Ok!");
                //BinaryWriter fwriter = new BinaryWriter(fos);
                //byte[] bytes = new byte[fos.Length];
                //fos.Read(bytes, 0, bytes.Length);
                //fos.Close();
                
                //MemoryStream ms = new MemoryStream(bytes);
                //ms.Position = 0;
                //Response.OutputStream.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);

                //1在线查看
                Response.OutputStream.Write(m.GetBuffer(), 0, m.GetBuffer().Length);
                Response.OutputStream.Flush();
                Response.OutputStream.Close();


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