How is the using pattern useful What is IDisposable How does it support deterministic finalization?

The using statement defines a scope at the end of which an object will be disposed. You create an instance in a using statement to ensure that Dispose is called on the object when the using statement is exited. A using statement can be exited either when the end of the using statement is reached or if, for example, an exception is thrown and control leaves the statement block before the end of the statement. The object you instantiate must implement the System.IDisposable interface. IDisposable is a very special interface. It is meant to be used with the "using" key Word so it is very different than most any other interface as it has compile time support. It is meant for _exception safe_ deterministic cleanup of resources.