How does the transition of objects from a non-assembly state to the first stage of garbage collection occur?

In .NET, objects that have no references (i.e., are not accessible from the code) are considered unreachable and transition to the first stage of the garbage collector — generation 0 (Gen 0).

The process is as follows:

1. The object is created and resides in generation 0.
2. If there are no references to the object, it is considered a candidate for garbage collection.
3. When the garbage collector runs, objects without references are marked for removal.

Thus, the transition from a non-collection state (unreachability) to the garbage collector stage occurs automatically when it is detected that there are no active references to the object, and it is moved to generation 0 for subsequent cleanup.