How to enable Tracing in WCF

To enable tracing on a WCF Service place the below xml in the web.config file under <configuration> section.

<system.diagnostics>

    <sources>

      <source name="System.ServiceModel" switchValue="All" propagateActivity="true">

        <listeners>

          <add type="System.Diagnostics.DefaultTraceListener" name="Default">

            <filter type="" />

          </add>

          <add name="xml">

            <filter type="" />

          </add>

        </listeners>

      </source>

      <source name="System.ServiceModel.MessageLogging" switchValue="All">

        <listeners>

          <add type="System.Diagnostics.DefaultTraceListener" name="Default">

            <filter type="" />

          </add>

          <add name="xml">

            <filter type="" />

          </add>

        </listeners>

      </source>

      <source name="XMLService.dll" switchValue="Warning, ActivityTracing">

        <listeners>

          <add type="System.Diagnostics.DefaultTraceListener" name="Default">

            <filter type="" />

          </add>

          <add name="xml">

            <filter type="" />

          </add>

        </listeners>

      </source>

    </sources>

    <sharedListeners>

      <add initializeData="C:\WCFServiceTrace.svclog"

        type="System.Diagnostics.XmlWriterTraceListener, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

        name="xml" traceOutputOptions="LogicalOperationStack, DateTime, Timestamp, ProcessId, ThreadId, Callstack">

        <filter type="" />

      </add>

    </sharedListeners>

    <trace autoflush="true" />

  </system.diagnostics>

You can find more information on Tracing here