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referenced by the current object, as you can t assume they are still alive at the point the garbage collector invokes your Finalize() method: // Override System.Object.Finalize() via finalizer syntax. class MyResourceWrapper { ~MyResourceWrapper() { // Clean up unmanaged resources here. // Beep when destroyed (testing purposes only!) Console.Beep(); } } If you were to examine this C# destructor using ildasm.exe, you would see that the compiler inserts some necessary error-checking code. First, the code statements within the scope of your Finalize() method are placed within a try block (see 7). The related finally block ensures that your base classes Finalize() method will always execute, regardless of any exceptions encountered within the try scope: .method family hidebysig virtual instance void Finalize() cil managed { // Code size 13 (0xd) .maxstack 1 .try { IL_0000: ldc.i4 0x4e20 IL_0005: ldc.i4 0x3e8 IL_000a: call void [mscorlib]System.Console::Beep(int32, int32) IL_000f: nop IL_0010: nop IL_0011: leave.s IL_001b } // end .try finally { IL_0013: ldarg.0 IL_0014: call instance void [mscorlib]System.Object::Finalize() IL_0019: nop IL_001a: endfinally } // end handler IL_001b: nop IL_001c: ret } // end of method MyResourceWrapper::Finalize If you then tested the MyResourceWrapper type, you would find that a system beep occurs when the application terminates, given that the CLR will automatically invoke finalizers upon AppDomain shutdown:

static void Main(string[] args) { Console.WriteLine("***** Fun with Finalizers *****\n"); Console.WriteLine("Hit the return key to shut down this app"); Console.WriteLine("and force the GC to invoke Finalize()"); Console.WriteLine("for finalizable objects created in this AppDomain."); Console.ReadLine(); MyResourceWrapper rw = new MyResourceWrapper(); }

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Not to beat a dead horse, but always remember that the role of the Finalize() method is to ensure that a .NET object can clean up unmanaged resources when it is garbage-collected. Thus, if you are building a class that does not make use of unmanaged entities (by far the most common case), finalization is of little use. In fact, if at all possible, you should design your types to avoid supporting a Finalize() method for the very simple reason that finalization takes time. When you allocate an object onto the managed heap, the runtime automatically determines whether your object supports a custom Finalize() method. If so, the object is marked as finalizable, and a pointer to this object is stored on an internal queue named the finalization queue. The finalization queue is a table maintained by the garbage collector that points to each and every object that must be finalized before it is removed from the heap. When the garbage collector determines it is time to free an object from memory, it examines each entry on the finalization queue and copies the object off the heap to yet another managed structure termed the finalization reachable table (often abbreviated as freachable, and pronounced effreachable ). At this point, a separate thread is spawned to invoke the Finalize() method for each object on the freachable table at the next garbage collection. Given this, it will take at the very least two garbage collections to truly finalize an object. The bottom line is that while finalization of an object does ensure an object can clean up unmanaged resources, it is still nondeterministic in nature, and due to the extra behind-the-curtains processing, considerably slower.

As you have seen, finalizers can be used to release unmanaged resources when the garbage collector kicks in. However, given that many unmanaged objects are precious items (such as raw database or file handles), it may be valuable to release them as soon as possible instead of relying on a garbage collection to occur. As an alternative to overriding Finalize(), your class could implement the IDisposable interface, which defines a single method named Dispose(): public interface IDisposable {