title: ReportViewer Render() export directy to file stream
body: <p>I want to export the reprot directly to file stream with the the ReportsViewer Render() method.
  I'm using the ReportViewer in LocalMode.</p>
  
  <p>Here's the method declaration according to MSDN</p>
  
  <pre><code>byte[] Render (
      string format,
      string deviceInfo,
      out string mimeType,
      out string encoding,
      out string fileNameExtension,
      out string[] streams,
      out Warning[] warnings
  )
  </code></pre>
  
  <p>The problem with this method is that te byte[] is written into the memory and after that written into a file by me. In my case with a very large report, there's way too much data in the memory and will probably cause OutOfMemoryExceptions on the prod system. 
  Is there anyway to make the report render directly into a file ? Thanks.</p>