Serialization

using System;
using System.Collections.Generic;
using System.Xml.Serialization;

namespace TCPAgent
{
    [XmlRoot("IncomingMessage")]
    public class TcpAgentXmlMessage
    {
        [XmlElement("facilitySMIS")]
        public List<FacilitySmisXml> FacilitiesNodes { get; set; }
    }

    public class FacilitySmisXml
    {
        public FacilitySmisXml()
        {
            FacilityId = null;
            SystemId = null;
        }

        [XmlAttribute("SystemId")]
        public string SystemId { get; set; }

        [XmlAttribute("facilityId")]
        public string FacilityId { get; set; }

        [XmlElement("parameterFacilitySMIS")]
        public ParameterFacilitySMISXml ParameterFacilitySMIS { get; set; }
    }

    public class ParameterFacilitySMISXml
    {
        public ParameterFacilitySMISXml()
        {
            ParamFacilityId = null;
        }

        [XmlAttribute("paramFacilityId")]
        public string ParamFacilityId { get; set; }

        [XmlElement("value")]
        public ValueXml Value { get; set; }
    }

    public class ValueXml
    {
        public ValueXml()
        {
            _dateFixation = new DateTime();
            Value = null;
            Description = null;
        }

        private DateTime _dateFixation;

        [XmlAttribute("dateFixation")]
        public string DateFixationString
        {
            get { return _dateFixation.ToString(); }
            set { DateTime.TryParse(value, out _dateFixation); }
        }

        [XmlIgnore]
        public DateTime DateFixation
        {
            get { return _dateFixation; }
            set { _dateFixation = value; }
        }

        [XmlAttribute("value")]
        public string Value { get; set; }

        [XmlAttribute("valueText")]
        public string Description { get; set; }
    }
}

public static T XmlDeserializeFromString<T>(string objectData)
        {
            return (T)XmlDeserializeFromString(objectData, typeof(T));
        }

private static object XmlDeserializeFromString(string objectData, Type type)
        {
            var serializer = new XmlSerializer(type);
            object result;

            using (TextReader reader = new StringReader(objectData))
            {
                result = serializer.Deserialize(reader);
            }

            return result;
        }