Question

What is the most suitable container just for strings holding in some array with non-predetermined upper boundary, which length is unknown on it’s creation.

For simple code like:

var list = new SomeContainer(); // size is unknown for()/foreach()/do()/while() // any loop {   list.Add(string); } 

Is it StringCollection as optimized Collection for string, or just Collection<string> or List<string> or ArrayList ? What is the different between them?

Answer 1

For what you need, List<string> is probably the most versatile. StringCollection was handy in 1.1, when (without generics) you needed specific classes for typed collections. Collection<string> is handy if you want to subclass it to provide validation etc.

Either way, in 3.5, LINQ will provide lots of additional methods for them – but without LINQ, List<T> has more features (Find, Sort, etc)