hello I have to work an an old application that used binaryFormatter to serialize application data into filestream (say in a file named "data.oldformat") without any optimizazion the main class has been marked with attribute

<serializable()>public MainClass
....... 
end class

and the serialization code

dim b as new binaryformatter
b.serialize(mystream,mymainclass)

In an attempt to optimize the serialization/deserialization process I simply made the class implement the ISerializable interface and wrote some optimized serialization routines

<serializable()>public MainClass
       implements ISerializable
....... 
end class

The optimization works really well but I MUST find a way to reatrive the data inside the old files for backward compatibility.

How can I do that??

Pierluigi