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In LINQ, Don’t Use Count() When You Mean Any()
Craig Stuntz's Weblog
– If you have a list, array, or query in a C#/LINQ application and need to check and see if the list is empty, the correct way to do this is to use the Any() extension method: if (q.Any()) { Similarly, you can check to see if any elements in the list meet a certain condition: if (q.Any(i => i.IsSpecial)) { If the query provider is something like LINQ to Entities, this will be translated into fairly efficient SQL using EXISTS. For some reason, I see a lot of people write this code using the Count() extension method instead (maybe they don’t know about Any()?), like this: if ...
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