How to combine multiple chunked zip files into single file using C#.Net? -

i have upload huge file using c# , mvc , here can able chunk big file several files using j-query slice(splitting files) function , uploaded server location. i'm not able open combined(merged) files again coded through c#.net.

mainly zip,.7z files not opened properly , rest of files .mp3, .doc,.pdf , etc opened in proper way.

here attached c# code

method 1:

private void joinfiles(string folderinputpath, string fileoutputpath) {         directoryinfo disource = new directoryinfo(folderinputpath);      filestream fssource = new filestream(fileoutputpath, filemode.append);              foreach (fileinfo fipart in disource.getfiles(@"*."))             {                 byte[] bytepart = system.io.file.readallbytes(fipart.fullname);                 fssource.write(bytepart, 0, bytepart.length);             }             fssource.close();  } 

method 2:

{ string[] tmpfiles = directory.getfiles(server.mappath("~/app_data/uploads/tamp"), "*.");                  filestream outputfile = null;                 string prevfilename = "";                  foreach (string tempfile in tmpfiles)                 {                     //string filename = path.getfilenamewithoutextension(tempfile);                     string basefilename = filename.substring(0, filename.indexof(convert.tochar(".")));                     string extension = path.getextension(filename);                      if (!prevfilename.equals(basefilename))                     {                         if (outputfile != null)                         {                             outputfile.flush();                             outputfile.close();                         }                         outputfile = new filestream(server.mappath("~/app_data/uploads/tamp") + "\\" + basefilename + extension, filemode.openorcreate, fileaccess.write);                     }                      int bytesread = 0;                     byte[] buffer = new byte[1024];                     filestream inputtempfile = new filestream(tempfile, filemode.openorcreate, fileaccess.read);                      while ((bytesread = inputtempfile.read(buffer, 0, 1024)) > 0)                         outputfile.write(buffer, 0, bytesread);                      inputtempfile.close();                     system.io.file.delete(tempfile);                     prevfilename = basefilename;                  }                  outputfile.close(); }