C# get md5 from bytes

 static byte[] GetBytesFromDic(Dictionary<string,string> dic)

        {

            if(dic==null || !dic.Any())

            {

                return null;

            }

            using (MemoryStream ms = new MemoryStream())

            {

                BinaryFormatter binFormatter = new BinaryFormatter();

                binFormatter.Serialize(ms, dic);

                byte[] dicBytes = ms.ToArray();

                return dicBytes;

            }

        }