Simplified Disposal and Compressed Streams

We can simplify the code that needs to check for a null object and then call its Dispose method by using the using statement. Generally, we would recommend using  using rather than manually calling Dispose is recommended unless we need greater control.

The using keyword

Confusingly, there are two uses for the using keyword:

• Importing a namespace.

• Generating a finally statement that calls Dispose on an object that implements IDisposable.

The compiler changes a using statement block into a try-finally statement without a catch statement. We can use nested try statements, so if we do want to catch any exceptions, we can, as shown in the following code example: