I have to include progress bar to show what percent of file is compressed. I have written the code but progress bar is not working.

FileInfo fileToCompress = fileInfo;
                    using (FileStream originalFileStream = fileToCompress.OpenRead())
                    {
                        if ((File.GetAttributes(fileToCompress.FullName) &
                           FileAttributes.Hidden) != FileAttributes.Hidden & fileToCompress.Extension != GZipConstants.GZExtension)
                        {
                           int length=Convert.ToInt32(originalFileStream.Length);
                            //string gzFileName = fileToCompress.FullName + GZipConstants.GZExtension;
                            string gzFileName;
                            if (!String.IsNullOrEmpty(targetDir))
                            {
                                string fileDetails = fileToCompress.FullName;
                                string getFileName = Path.GetFileName(fileDetails);
                                gzFileName = targetDir + getFileName + GZipConstants.GZExtension;
                                disp = getFileName;
                                //System.IO.Directory.CreateDirectory(targetDir + getFileName); // user provided path
                            }
                            else
                            {
                                string fileDetails = fileToCompress.FullName;
                                string getFileName = Path.GetFileName(fileDetails);
                                disp = getFileName;
                                gzFileName = fileToCompress.FullName + GZipConstants.GZExtension;
                            }
                            if (File.Exists(gzFileName))
                            {
                                File.Delete(gzFileName);
                            }
                            //int nPercentToAdvance = (100 / filesTPF.Length);
                            // create .gz file and copy the data
                            using (FileStream compressedFileStream = new FileStream(gzFileName, FileMode.Create, FileAccess.Write))
                            {
                                using (GZipStream compressionStream = new GZipStream(compressedFileStream, CompressionMode.Compress))
                                {
                                    // originalFileStream.CopyTo(compressionStream); // read all the bytes from the current stream  and writes them to destination stream

                                    // Copy the source file into the compression stream.
                                    byte[] buffer = new byte[GZipConstants.GZBufferSize];
                                    int numRead;
                                    int countPrg = 0;
                                    while ((numRead = originalFileStream.Read(buffer, 0, buffer.Length)) != GZipConstants.ZERO)
                                    {
                                        if ((cancel!=null)&&cancel())
                                        {
                                            break;
                                        }
                                        compressionStream.Write(buffer, GZipConstants.ZERO, numRead);
                                        countPrg = numRead + countPrg;
                                        if (countPrg==length)
                                        {
                                            progressStatus((countPrg * 100) / length, GZipConstants.GZipFile + fileToCompress.Name);
                                        }

                                    }
                            
                                }
                            }

                        }
                    }