What is the meaning of Linq-to-sql orderby and thenby?

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In Linq-to-SQL, the orderby keyword is used to sort a sequence of elements in ascending or descending order based on one or more criteria. The thenby keyword is used to further sort the elements in ascending or descending order based on another criterion after the initial sorting has been done. Together, orderby and thenby allow you to create a multi-level sort order for your data.