Level up your LINQ skills with practical tips that make C# queries faster and easier to maintain. We cover let, Aggregate, GroupBy, ToLookup, dynamic filters with WhereIf, SelectMany, and how to safely switch between SQL translation and in-memory logic using AsEnumerable(). You’ll learn when to materialize with ToList(), how to paginate with Skip/Take correctly, and how to reuse filters with expression trees. Realistic examples, EF Core insights, and a friendly, beard-approved pace.
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