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} public void Dispose() { GC.SuppressFinalize(this); Dispose(true); } protected virtual void Dispose(bool fDisposing) { if(disposed_) { return; } if(fDisposing) { Console.WriteLine("Free managed resources"); } Console.WriteLine("Free unmanaged resources"); disposed_ = true; } private bool disposed_ = false; public static void Main() { using(R r = new R()) { ; } } } As you can see, it s not trivial to implement. You need to derive your class from System.IDisposable and implement this interface by defining the Dispose() method. The Dispose(bool) method is used to distinguish between direct calls to dispose the object, such as those generated by a using block, and indirect calls, such as those generated during garbage collection. There are several keys to understanding this code: Use a local flag, such as disposed_ in the previous example, to ensure that resources are not released more than once by mistake. In the sample code, a distinction is made between code that is called via a direct call to Dispose from a using block and an indirect call from the garbage collector. The direct calls generate Dispose(true) calls, and the indirect calls generate Dispose(false) calls. If disposing of the object occurs during garbage collection, you should not free any managed resources associated with the object. Therefore Dispose(false) does not free managed resources. When Dispose() is called directly, such as at the end of a using block, the garbage collector must be notified that garbage collection is unnecessary and should be suppressed. This is accomplished via the call to GC.SuppressFinalize(this). barcode asp.net web control Dynamically Generate and Display Barcode Image in ASP . Net 31 May 2012 ... First you will need to download the Free Barcode Font from the following URL ...the Barcode Image and displays it on the ASP . Net page. C# . asp.net generate barcode to pdf Free . 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The same example follows in C++/CLI: using namespace System; ref struct R { R() { disposed_ = false; } !R() { Console::WriteLine("Free unmanaged resources"); } ~R() { GC::SuppressFinalize(true); if(!disposed_) { disposed_ = true; Console::WriteLine("Free managed resources"); this->!R(); } } static void Main() { R r; } private: bool disposed_; }; void main() { R::Main(); } The C++/CLI sample is much easier to understand as well as to maintain. You do need to initialize the member variable disposed_ separately from the declaration and within the constructor, but you already saw this difference from C# in 6. The C++ destructor houses the equivalent of Dispose(true), and the C++ finalizer houses Dispose(false). The code implements the IDisposable interface automatically, and allocating R on the stack in the method R::Main() ensures that it is destroyed when the method completes execution. This happens thanks to deterministic destruction in the C++ language. 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