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;            }        }