Benefit/Use of using statement before streamwriter , streamreader [duplicate]

Answer 1

The using provides a convenient syntax that ensures the correct use of IDisposable objects. It is compiled into:

StreamReader sr = new StreamReader(path);
try 
{
    while (sr.Peek() >= 0) 
        Console.WriteLine(sr.ReadLine());
} finally
{
    sr.Dispose();
}

As documented on MSDN