iTextSharp.text.pdf.PdfStamper.Dispose C# (CSharp) Метод

        public virtual void Dispose()
        {
            Close();
        }

        public HttpResponseMessage UpdatePdfDoc(UpdatePDF updatePDF)
        {
            HttpResponseMessage response = null;

            try
            {
                string ExistingVariableinPDF = updatePDF.ExistingVariableinPDF;
                string ReplacingVariable     = updatePDF.ReplacingVariable;
                string ReplacingDateVariable = updatePDF.ReplacingDateVariable;
                string sourceFile            = @updatePDF.sourceFile;
                Guid   guid = Guid.NewGuid();

                FileInfo fileInfo     = new FileInfo(sourceFile);
                string   tempfilename = Path.Combine(fileInfo.Directory.FullName, guid.ToString() + fileInfo.Extension);
                string   destFile     = @tempfilename;

                PdfReader  pReader       = new PdfReader(sourceFile);
                int        numberOfPages = pReader.NumberOfPages;
                FileStream fileStream    = new System.IO.FileStream(destFile, System.IO.FileMode.Create);
                stamper = new iTextSharp.text.pdf.PdfStamper(pReader, fileStream);
                PDFTextGetter(ExistingVariableinPDF, ReplacingVariable, StringComparison.CurrentCultureIgnoreCase, sourceFile, destFile);
                if (!String.IsNullOrEmpty(ReplacingDateVariable))
                {
                    PDFTextGetter(ReplacingDateVariable, DateTime.Now.DisplayWithSuffix(), StringComparison.CurrentCultureIgnoreCase, sourceFile, destFile);
                }

                stamper.Close();
                stamper.Dispose();
                pReader.Close();
                pReader.Dispose();
                fileStream.Close();
                fileInfo.Refresh();

                File.Delete(sourceFile);
                response = Request.CreateResponse(System.Net.HttpStatusCode.OK, guid.ToString());
            }
            catch (Exception ex)
            {
                response = new HttpResponseMessage(System.Net.HttpStatusCode.InternalServerError);
                Logger.WriteLog("Exception while UpdatePdfDoc " + ex.Message + Environment.NewLine + ex.StackTrace);
            }

            // File.Move(tempfilename, sourceFile);
            return(response);
        }