Deferred Query « LINQ « C# / C Sharp

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1.	Deferred Query Execution: shows how query execution is deferred until the query is enumerated at a foreach statement.
2.	How queries can be executed immediately with operators such as ToList().
3.	Shows how queries can be reused
4.	Deferred Query Execution
5.	Immediate Query Execution
6.	A deferred execution query is reevaluated when you reenumerate:
7.	most query operators is that they execute not when constructed, but when enumerated

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