Enable logging using diagnostics for Web application

<configuration>

<system.diagnostics>

    <sources>

      <source name="System.ServiceModel"

              switchValue="Error">

        <listeners>

          <add name="traceListener"

              type="System.Diagnostics.XmlWriterTraceListener"

              initializeData= "Traces.svclog" />

        </listeners>

      </source>

    </sources>

  </system.diagnostics>

   

</configuration>