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Do not expose generic lists  C# (CA1002)

The rule of thumb to remember is expose as little as possible and make sure that you use the appropriate type based on your business logic.
Now looking at the CA1002 Warning from the MSDN site Microsoft it says that the List<T> Generic was built for performance and not inherence.
Ok fair enough but what does that mean?
Well to start of it means that object does not contain any virtual methods you can overwrite if you inherit from the List<T> .

 

Here I use the new keyword to hide the add method of the inherited Add method of the inherited List<string>

Here is a list of Generic Collections that are designed for inheritance. .

 

List<T> as a return type.

You also get this CA1002 when your List<T> is a return type in a function, In most cases I ignore this error for the simple reason that I am not writing an framework or public API. This does not mean that if you have a single application that you should return lists everywhere. Keep in mind that a List<T> has Add and Remove functionality and your object owner is not notified when if the collection is modified.
Rule of thumb that I have used is return only what is needed:

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