<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>