how to download video file in asp.net with example

public static void GetMovie(string FileLocation, string Url)
        {
            try
            {
                string Content = FileManager.GetFileContents(new Uri(Url));
                Regex TempRegex = new Regex("var swfArgs = {(.*)}");
                Match Match = TempRegex.Match(Content);
                Content = Match.Value;
                TempRegex = new Regex("\"video_id\": \"(.*?\")");
                string VideoLocation = "http://www.youtube.com/get_video?video_id=";
                Match = TempRegex.Match(Content);
                VideoLocation += Match.Groups[1].Value.Replace("\"", "");
                VideoLocation += "&l=";
                TempRegex = new Regex("\"length_seconds\": \"(.*?\")");
                Match = TempRegex.Match(Content);
                VideoLocation += Match.Groups[1].Value.Replace("\"", "");
                VideoLocation += "&t=";
                TempRegex = new Regex("\"t\": \"(.*?\")");
                Match = TempRegex.Match(Content);
                VideoLocation += Match.Groups[1].Value.Replace("\"", "");
                Stream TempStream;
                FileManager.GetFileContents(new Uri(VideoLocation), out TempStream);
                BinaryReader TempReader = new BinaryReader(TempStream);
                List<byte> Bytes = new List<byte>();
                while (true)
                {
                    byte[] Buffer = new byte[1024];
                    int Length = TempReader.Read(Buffer, 0, 1024);
                    for (int x = 0; x < Length; ++x)
                    {
                        Bytes.Add(Buffer[x]);
                    }
                    if (Length == 0)
                        break;
                }
                FileManager.SaveFile(Bytes.ToArray(), FileLocation);
            }
            catch { }
        }