gistfile1.xsl

<errorFilter>
  <test>
    <!-- http://groups.google.com/group/elmah/t/cbe82cee76cc6321 -->
    <and>
      <is-type binding='Exception' 
               type='System.Web.HttpException, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' />
      <regex binding='Exception.Message' 
             pattern='invalid\s+viewstate' 
             caseSensitive='false' />
      <regex binding='Context.Request.UserAgent' 
             pattern='Trident/4(\.[0-9])*' 
             caseSensitive='false' />
    </and>
  </test>
</errorFilter>