how to use C# convert .torrent to magnet?

static class Program
    {
        static void Main(string[] args)
        {
            if (args.Length == 1)
            {
                var inFileStream = new FileStream(args[0], FileMode.Open);
				
                var transform = new BObjectTransform();
				BDictionary bObject = transform.DecodeNext(inFileStream) as BDictionary;
	            IBObject info = bObject.FindSection("info");
	            string fileName = ((info as BDictionary).FindSection("name") as BByteString).ConvertToText(Encoding.ASCII);
	            byte[] infoData = info.ToByteArray();
	            string hashString = Sha1Encode(infoData);
	            string magnetLink = string.Format("magnet:?xt=urn:btih:{0}&db={1}", hashString, fileName);
				Console.WriteLine(magnetLink);

            }
            else
            {
                Console.WriteLine("\nSyntax is:\nOSS.SampleApp.exe <torrent file="" path="">");
            }
        }

	    private static string Sha1Encode(byte[] bytes)
	    {
		    using (SHA1 hasher = new SHA1Managed())
		    {
				return Base32Encoder.Encode(hasher.ComputeHash(bytes));
		    }
	    }

		public static IBObject FindSection(this BDictionary dictionary, string sectionName)
		{
			if (dictionary == null)
				throw new ArgumentNullException();

			foreach (KeyValuePair<bbytestring,> keyValuePair in dictionary.Value)
			{
				string key = keyValuePair.Key.ConvertToText(Encoding.ASCII);
				if (key == sectionName)
					return keyValuePair.Value;
			}

			return null;
		}

		public static byte[] ToByteArray(this IBObject obj)
		{
			using (MemoryStream MS = new MemoryStream())
			{
				var transform = new BObjectTransform();
				transform.EncodeObject(obj, MS);
				MS.Position = 0;
				return MS.ToArray();
			}
		}
    }