IEnumerable

IEnumerable:

• IEnumerable exists in the System.Collections namespace.
• IEnumerable is suitable for querying data from in-memory collections like List, Array and so on.
•       While querying data from the database, IEnumerable executes “Select Query” on the server-side, loads data in-memory on the client-side and filters the data.
•     IEnumerable is beneficial for Linq to Object and Linq to XML Queries.
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• IEnumerable doesn’t support Add or Remove items from the List.
• Using IEnumerable we can find out the no of elements in the collection after iterating the collection.
• IEnumerable supports deferred execution.
• IEnumerable supports further filtering.  
•       IEnumerable can move forward only over a collection. It can’t move backward and between the items.
•       IEnumerable is best to query data from in-memory collections like List, Array etc,
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