How to keep string data for having best performance when selecting string list via LINQ by StartsWith and EndsWith queries?

If all you want is efficiently finding words that start or end with given substring, employing the SortedSet will help you do that in O(log(N)) time.

A string list should be sufficiently performant for selecting from, but you're adding some boxing/unboxing operations by selecting into and then iterating over a var. You can use a strongly-typed List as your recipient of LINQ query results for a performance boost, but it'll likely only be noticeable for very large datasets.

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