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Possible Duplicates:
IList<int> vs List<int>
C# - List<T> or IList<T>
What is the difference between List and IList, which one has better performance and when to use List over IList and vice versa?
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The main difference between List and IList in C# is that List is a class that represents a list of objects which can be accessed by index while IList is an interface that represents a collection of objects which can be accessed by index.
Microsoft guidelines as checked by FxCop discourage use of List<T> in public APIs - prefer IList<T>.
Results. IList<T> uses 40 Bytes more than List<T> .
IList doesn't support further filtering. IEnumerable exists in System. Collections Namespace. IEnumerable is a forward only collection, it can't move backward and between the items.
In C# List is a concrete implementation of the IList interface. The List is an implementation of the IList Interface. The idea is to program against the interface, not the implementation. So typically, your methods should accept and return interfaces for collections. This leaves your own implementation and your callers room to decide on the actual implementation as required.
Benefit of using an Interface is that you get to implement your functionality or better yet, the only functionality you require. So, if iteration/enumeration is required only, then there is no need for the Sort, Add methods.
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List implements IList interface
IList is a interface and doesn't have any implementation, so the performance of IList depending the class it implements
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