title: Deciphering the .NET clr20r3 exception parameters P1..P10
body: <p>I'm trying to decipher the meaning on the P1...P10 parameters associated with a <code>clr20r3</code> that is written to the event log when my application experiences an exception.</p>
  
  <p>The best I've <a href="http://www.dimensionsusers.com/forum/viewtopic.php?f=29&amp;t=148" rel="noreferrer">been able to find</a> is:</p>
  
  <ul>
  <li><strong>P1</strong>: the hosting process (<em>e.g.</em> <code>w3wp.exe</code>)</li>
  <li><strong>P2</strong>: the hosting process version (<em>e.g.</em> <code>6.0.3790.1830</code>)</li>
  <li><strong>P3</strong>: ??? (<em>e.g.</em> <code>42435be1</code>)</li>
  <li><strong>P4</strong>: the assembly from which the exception was raised (<em>e.g.</em> <code>mrtables.webservice</code>)</li>
  <li><strong>P5</strong>: the assembly version (<em>e.g.</em> <code>2.1.2.0</code>)</li>
  <li><strong>P6</strong>: ??? (<em>e.g.</em> <code>4682617f</code>)</li>
  <li><strong>P7</strong>: ??? (<em>e.g.</em> <code>129</code>)</li>
  <li><strong>P8</strong>: ??? (<em>e.g.</em> <code>50</code>)</li>
  <li><strong>P9</strong>: the exception type raised (<em>e.g.</em> <code>system.argumentexception</code>)</li>
  <li><strong>P10</strong>: ??? (<em>e.g.</em> <code>NIL</code>)</li>
  </ul>
  
  <p><a href="http://google.com/?q=clr20r3+" rel="noreferrer">Googling for clr20r3</a> provides thousands of sample parameter values, from which someone can try to derive a pattern.</p>
  
  <p>But I'm hoping for documentation on the parameter meanings, as opposed to educated guesses.</p>
  
  <hr>
  
  <p><strong>Edit:</strong> While I can hope for canonical documentation, really I'd be happy to see the exception being thrown, at what line, complete with a stack trace.</p>
  
  <h2>Bonus Reading</h2>
  
  <ul>
  <li><a href="https://stackoverflow.com/questions/1937931/unhandled-exception-that-caused-the-application-to-crash-with-eventtype-clr20r3">Unhandled exception that caused the application to crash with &quot;EventType clr20r3, P1 w3wp.exe&quot; in the log, but no details there</a> <em>(asking for help with a problem, while we're asking for a canonical explanation of what the parameters mean)</em></li>
  </ul>