Serialization XML with XmlElement(Order) on abstract method

Hi all,
my name is Giulian and I'm writing from Italy.

I have a big problem with XML Serialization on the override method inherited from abstart class.
I want to create an XML file with a detail order of Tags and so I have use the property "Order" of XmlElement for all public methods.

The problem concern that the serialization fail with a Reflection error.
From window error message I have this error (transalte from italian language):

"Incorret sequence: the property Order is necessary for all method.
Set the Order with XmlElement, XmlAnyElement or XmlaArray for method
methodA.


This is the simple example of my code:

public abstract class A
{
   public abstart string methodA(get;set;);
}

[Serializable]
public class B : A
{
   private string data1;
   private string data2;
   private string data3;
   ecc...

  [XmlElement(Order=0)]
  public string Data1
  {
      get
      {...}
      set
      {...}
  }
 
  [XmlElement(Order=1)]
  public string Data2
  {
      get
      {...}
      set
      {...}
  }

  [XmlElement(Order=2)]
  override public  string methodA
  {
      get
      {
         return this.data3;
      }
      set
      {
         this.data3=value;
      }
  }

}

I have try to comment the abstract method from class A and B and serialization running successfull without tag "data3".

I don't understand how to fix this situation....
Xlm order can works with override method?

Any idea?

Thanking in advance and sorry for my english.

Giulian