Setting an object to null and invoking GC are common assumptions made by developers when working with background tasks in C#.Collect() guarantees that its memory is recovered. The item won't be gathered, though, if it is still being referenced by an ongoing job. Memory retention problems may result from this behavior, particularly in applications that operate for a long time. Writing efficient code requires an understanding of how asynchronous activities and garbage collection interact. Proper use of weak references, cancellation tokens, and task management techniques can help prevent unwanted memory consumption.