I've tried to be descriptive :) It's rather programming-style problem than coding problem in itself.

Let's suppose we have :

A:

public class MyDict {
     public Dictionary<int,string> dict;
     // do custom-serialization of "dict"
     public void SaveToFile(...);
     // customized deserialization of "dict"
     public void LoadFromFile(...);
} 

B:

public class MyDict : Dictionary<int,string>
{

}

Which option would be better in the matter of programming style ? class B: is to be de/serialized externally.

Main problem is : is it better to create new class (which would have only one property - like opt A:) or to create a new class derived - like opt B: ? I don't want any other data processing than adding/removing and de/serializing to stream.

Thanks in advance!