using-equivalence - The control structure 'using' defined by 'try-finally'.

Lecture 10 - slide 7 : 40 Program 1

// The using statement ...

  using (type variable = initializer)
    body

// ... is equivalent to the following try-finally statement

  {type variable = initializer;
    try {
      body
    }
    finally {
      if (variable != null) 
         ((IDisposable)variable).Dispose();
    }
  }