How does LINQ deferred execution interact with real-time data changes?

Deferred execution re-evaluates queries on each enumeration, so results reflect the latest data state.

LINQ queries defined over IEnumerable or IQueryable are not executed at definition time. Instead, they execute when enumerated. This means that if the underlying data changes between enumerations, the query results also change. In database-backed LINQ (IQueryable), each execution may re-hit the database, meaning results are always fresh unless explicitly cached or materialized. This behavior is powerful but dangerous in systems requiring consistency, as it can lead to non-repeatable reads and inconsistent UI states if not controlled properly.