title: FileStream Read/Write method's limitation
body: <p>FileStream's read/write  method can take only <code>integer</code> value as length. But <code>FileStream</code>object returns length in <code>long</code>. In this case, what if file size is larger than <code>integer</code> value (approximate more than 2GB). Then how FileStream's read/write method handle <code>long</code> value.</p>