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;
            }
        }