what is the basic difference between System.Linq.IQueryable and System.Collections.Generic.List which one is faster and when to use what?
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Difference is they are *Apples and oranges* – Sriram Sakthivel Apr 14 '14 at 10:27
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An IQueryable<T> is an interface which abstracts some type of query. This query can be executed (by iterating over the query), but you have to use ToList<T> to convert (the results of) the query into a list.
A List<T> is just a list which can contain some objects. Ready for you to be retrieved when you need them.
Maarten
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