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The Where feature defined in the Specification behaves the same as Where in Linq, and it accepts Expression<Func<TSource, bool>> expression as a parameter.

Where is used to select objects meeting a certain criteria, as defined by a lambda expression. For example:

Query.Where(x => x.Id == Id);

This query will select an object x if x.Id is equal to Id. Note that while this particular query likely selects a single object (since Ids should generally be unique), the Where operator will select all objects matching the specified criteria.