trace listeners

App.config

var logSW = new StreamWriter("output.txt", false);
            logSW.AutoFlush = true;
            Trace.Listeners.Add(new TextWriterTraceListener(logSW));
            Trace.Listeners.Add(new ConsoleTraceListener(true));  
  
  
  
  <system.diagnostics>
    <trace autoflush="true" indentsize="4">
      <listeners>
        <add name="console" type="System.Diagnostics.ConsoleTraceListener" />
        <add name="file" type="System.Diagnostics.TextWriterTraceListener" initializeData="TextWriterOutput.log" />
        <remove name="Default" />
      </listeners>
    </trace>
  </system.diagnostics>