public class Sample
{

public static int Main(string[] args) {
    // Create a file for output named TestFile.txt.
    Stream myFile = File.Create("TestFile.txt");
 
    /* Create a new text writer using the output stream, and add it to
     * the trace listeners. */
    TextWriterTraceListener myTextListener = new 
       TextWriterTraceListener(myFile);
    Trace.Listeners.Add(myTextListener);
 
    // Write output to the file.
    Trace.Write("Test output ");

    // Flush the output.
    Trace.Flush(); 

    return 0;
 }
}

#define DEBUG

using System;
using System.Globalization;
using System.Diagnostics;

class MainClass
{
  public static void Main() 
  {
    TextWriterTraceListener tl = new TextWriterTraceListener("Example21_12.txt");
    Debug.Listeners.Add(tl);
    
    EventLogTraceListener t2 = new EventLogTraceListener("Application");
    Debug.Listeners.Add(t2);

    Debug.WriteLine("Starting Main()");
    Debug.Assert(1 == 2, "1 ==2");

    Debug.WriteLine("Exiting Main()");
    Debug.Flush();
    Debug.Close();
  }
}