C# Trace

  <system.diagnostics>
    <sources>
      <source name="TraceSourceApp" switchValue="All">
        <listeners>
          <add name="xml"/>
        </listeners>
      </source>
    </sources>
    <sharedListeners>
      <add name="xml" type="System.Diagnostics.XmlWriterTraceListener" initializeData="log.svclog"/>
    </sharedListeners>
    <trace autoflush="true" indentsize="4">
      <listeners>
        <clear/>
        <add name="xml"/>
      </listeners>
    </trace>
  </system.diagnostics>