XmlReader tr = XmlReader.Create(client.GetStream());

            foreach (var deSer in MessageTypes._XmlSerialisers)
            {
                Console.WriteLine(deSer.GetType());
                if(deSer.CanDeserialize(tr))
                {
                    Console.WriteLine("przed serializacji");
                    Data d = (Data)deSer.Deserialize(tr);
                    Console.WriteLine("po serializacji");
                    Console.WriteLine(d.GetType());
                    break;
                }
            }