GroupBy « LINQ « C# / C Sharp

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1.	Use Group By
2.	GroupBy partitions a list of numbers by their remainder when divided by 5.
3.	uses group by to partition a list of products by category.
4.	uses group by to partition a list of each customer's orders, first by year, and then by month.
5.	uses GroupBy to partition trimmed elements of an array using a custom comparer

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