Serialization and Deserialization

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C#3.0

C#

hello, iam new to c#, i have requirement on windows form xml serialization and deserialization.i have done on serialization object to xml it is working fine.but deserialization i am not getting full xml what we have save earlier by using serialization.can any one help me plz please.
save xml is working, but how to retrive that xml using Deserialization

TradeTicket>
------------
------------
-------------
/TradeTicket>


SwapLegA
-----------
-----------
-----------
-----------
/SwapLegA>

SwaplegB>
--------
---------
--------
/SwaplegB>

/TradeTicket>

private void btnSerialize_Click(object sender, EventArgs e)
{
 TradeTicket t = new TradeTicket()
 {
--------
---------
 }
t.Positions.Add(new SwapLegA())
{
-----------
-----------
}

t.Positions.Add(new SwapLegB())
{
-------------
----------------
}


  XmlAttributeOverrides specific_attributes = new XmlAttributeOverrides();
            XmlAttributes attrs = new XmlAttributes();
            attrs.XmlElements.Add(new XmlElementAttribute(typeof(SwapLegA)));
            attrs.XmlElements.Add(new XmlElementAttribute(typeof(SwapLegB)));
            specific_attributes.Add(typeof(TradeTicket), "Positions", attrs);
            XmlSerializer ser = new XmlSerializer(typeof(TradeTicket), specific_attributes);
                       
            XmlDocument serDoc = new XmlDocument();
            //XmlSerializer ser = new XmlSerializer(st.GetType());
            StringBuilder sb = new StringBuilder();
            StringWriter writer = new StringWriter(sb);

            ser.Serialize(writer, t);
            serDoc.LoadXml(sb.ToString());            
            MessageBox.Show(serDoc.OuterXml);
            serDoc.Save("D:\\SwapTicketAB.xml");
}

At the time of deserialization i am getting only TradeTicket fields
any plz tel please tell me how to get full xml with swaplegs.
Thanks in Advance.