IEnumerable - When you to deal with in process memory object collections and loop through the collection objects.
IQueryable - When you have to run ad-hoc queries against datasource like LINQ to SQL Server Entity Framework and other sources which implemented IQueryable.
IList - Add, remove or refer to an item by index.
my thanks to:
http://www.youtube.com/watch?v=oiFPblrire8&feature=plcp
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