Attempt at partially downloading a video for use in ffmpeg

DownloadPartial.cs

 private static StreamReader DownloadPartial(SUri url, int bytesToGet)
        {

            string result = string.Empty;
            HttpWebRequest request;
          
            request = WebRequest.Create(url) as HttpWebRequest;

            //get first 1000 bytes
            request.AddRange(0, bytesToGet - 1);

            // the following code is alternative, you may implement the function after your needs
            WebResponse response = request.GetResponse();
                return new StreamReader(response.GetResponseStream());
                
  

        }


          public static string DownloadFile(string directory, SpaetzelUtilities.SUri url, int bytesToGet)
        {
            if (!url.IsNullOrEmpty() )
            {
                if (!Directory.Exists(directory))
                {
                    Directory.CreateDirectory(directory);
                }


           //     string fileName = url.Substring(url.LastIndexOf("/") + 1);

                string extension = Utilities.GetFilenameExtension(url.ToString());
                    

                string fileName = Spaetzel.UtilityLibrary.Utilities.CalculateMd5Hash(url.ToString()) + "." + extension;



                
                string fullPath = directory + "/" + fileName;

                if (!File.Exists(fullPath))
                {
                    // Don't download the file twice
                   

                    try
                    {
                        Console.WriteLine(String.Format("Downloading {0}", url));

                        var result = DownloadPartial(url, bytesToGet);


                        using (BinaryWriter writer = new BinaryWriter(File.Open(fullPath, FileMode.Create)))
                        {
                       

                            var file = result.ReadToEnd();

                            writer.Write(file);
                        }



                    }
                    catch (WebException)
                    {
                        // Got a 404 or 500 from the site
                        return "";
                        //return fullPath;
                    }

                   
                }
                

              //  var fullPath = Utilities.DownloadFile(directory, url);
                return fullPath;

            }
            else
            {
                return "";
            }
        }