C#向PDF指定區域添加文字或圖片

            string url = Server.MapPath("../../WebFiles/教師職業發展報告.pdf");
            PdfReader pdfReader = new PdfReader(Server.MapPath("../../WebFiles/教師職業發展報告.pdf"));//讀pdf
            PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(Server.MapPath("../../WebFiles/FZBG/" + studyClassId + "/教師職業發展報告-" + dt.Rows[0]["Name"] + ".pdf"), FileMode.Create, FileAccess.Write, FileShare.None));
            BaseFont baseFont = BaseFont.CreateFont("C:\\Windows\\Fonts\\simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);//獲取系統的字體
            BaseFont baseFontk = BaseFont.CreateFont("C:\\Windows\\Fonts\\simkai.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);            #region 第一頁#endregion
            #region 第二頁
            iTextSharp.text.Font font2 = new iTextSharp.text.Font(baseFont, 11);//字體樣式
            Phrase ActualName2 = new Phrase(dt.Rows[0]["ActualName"].ToString(), font2);//姓名
            Phrase StudentId = new Phrase(dt.Rows[0]["Name"].ToString(), font2);//學號
            PdfContentByte over2 = pdfStamper.GetOverContent(2);//pdf頁數
            ColumnText.ShowTextAligned(over2, Element.ALIGN_CENTER, ActualName2, 265, 600, 0);//姓名
            iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(Server.MapPath("../../WebFiles/Picture/" + dt.Rows[0]["Name"].ToString() + ".jpg"));
            img.ScaleAbsolute(72, 100);
            img.SetAbsolutePosition(76, 475);
            over2.AddImage(img);
            #endregion
            
            pdfStamper.Close();