how garbage collection is done in c#?

The system has low physical memory. This is detected by either the low memory notification from the OS or low memory indicated by the host.
The memory that is used by allocated objects on the managed heap surpasses an acceptable threshold. This threshold is continuously adjusted as the process runs.
The GC.Collect method is called. In almost all cases, you do not have to call this method, because the garbage collector runs continuously. This method is primarily used for unique situations and testing.

For more details refer below link.

https://docs.microsoft.com/en-us/dotnet/standard/garbage-collection/fundamentals

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