// Upload partial file
 private void UploadPartialFile(string fileName, HttpContext context, List <FilesStatus> statuses)
 {
     StorageManager.UploadPartialFile(fileName, context, statuses);
 }
 // Delete file from the server
 private void DeleteFile(HttpContext context)
 {
     StorageManager.DeleteFile(context);
 }
 // Upload file to the server
 private void UploadFile(HttpContext context)
 {
     StorageManager.UploadFile(context);
 }
 // Upload entire file
 private void UploadWholeFile(HttpContext context, List <FilesStatus> statuses)
 {
     StorageManager.UploadWholeFile(context, statuses);
 }