[c#] What is the correct way to free memory in C#

  1. Yes
  2. What do you mean by the same? It will be re-executed every time the method is run.
  3. Yes, the .Net garbage collector uses an algorithm that starts with any global/in-scope variables, traverses them while following any reference it finds recursively, and deletes any object in memory deemed to be unreachable. see here for more detail on Garbage Collection
  4. Yes, the memory from all variables declared in a method is released when the method exits as they are all unreachable. In addition, any variables that are declared but never used will be optimized out by the compiler, so in reality your Foo variable will never ever take up memory.
  5. the using statement simply calls dispose on an IDisposable object when it exits, so this is equivalent to your second bullet point. Both will indicate that you are done with the object and tell the GC that you are ready to let go of it. Overwriting the only reference to the object will have a similar effect.

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