Filtering System.Diagnostics Trace messages

gistfile1.xml

<system.diagnostics>
	<!-- Add multiple sources for varying levels of tracing -->
	<sources>
		<source name="debugSource" switchName="defaultSwitch" switchType="System.Diagnostics.SourceSwitch">
			<listeners>
				<add name="eventLogListener" type="System.Diagnostics.EventLogTraceListener" initializeData="ASP.NET 2.0.50727.0" />
			</listeners>
		</source>
	</sources>
	<switches>
		<add name="defaultSwitch" value="Error"/>
		<!-- See System.Diagnostics.SourceLevels enum -->
	</switches>
	<trace autoflush="false" indentsize="4">
		<listeners>
			<add name="eventLogListener" type="System.Diagnostics.EventLogTraceListener" initializeData="ASP.NET 2.0.50727.0" />
		</listeners>
	</trace>
</system.diagnostics>