gistfile1.txt

App.Config
<system.diagnostics>
	<switches>
		<add name="TraceLoggerOn" value="0" />
	</switches>
	<trace autoflush="true" indentsize="4">
		<listeners>
			<add name="myListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="D:\Logs\TraceLogger.log" traceOutputOptions="DateTime, ThreadId" >
				<filter type="System.Diagnostics.EventTypeFilter" initializeData="Information" />
			</add>
			<remove name="Default" />
		</listeners>
	</trace>
</system.diagnostics>

using System;
using System.Diagnostics;

    public static class TraceLogger
    {
        public static void LogInformation(Func<string> getMessage)
        {
            if (new BooleanSwitch("TraceLoggerOn", string.Empty).Enabled)
            {
                Trace.TraceInformation(getMessage());
            }
        }
    }