Waiting for multiple events

using System;
using System.IO;
using System.Security.Permissions;
using System.Threading;
// Request permission to create and write files to C:\TestTest.
[assembly: FileIOPermissionAttribute(SecurityAction.RequestMinimum,
All = @"C:\TestTest")]
class Test
{
static void Main()
{
const int numberOfFiles = 5;
string dirName = @"C:\TestTest";
string fileName;
byte[] byteArray;
Random randomGenerator = new Random();
ManualResetEvent[] manualEvents =
new ManualResetEvent[numberOfFiles];
State stateInfo;
if(!Directory.Exists(dirName))
{
Directory.CreateDirectory(dirName);
}
// Queue the work items that create and write to the files.
for(int i = 0; i < numberOfFiles; i++)
{
fileName = string.Concat(
dirName, @"\Test", i.ToString(), ".dat");
// Create random data to write to the file.
byteArray = new byte[1000000];
randomGenerator.NextBytes(byteArray);
manualEvents = new ManualResetEvent(false);
stateInfo =
new State(fileName, byteArray, manualEvents);
ThreadPool.QueueUserWorkItem(new WaitCallback(
Writer.WriteToFile), stateInfo);
}

// Since ThreadPool threads are background threads,
// wait for the work items to signal before exiting.
WaitHandle.WaitAll(manualEvents);
Console.WriteLine("Files written - main exiting.");
}
}
// Maintain state to pass to WriteToFile.
class State
{
public string fileName;
public byte[] byteArray;
public ManualResetEvent manualEvent;
public State(string fileName, byte[] byteArray,
ManualResetEvent manualEvent)
{
this.fileName = fileName;
this.byteArray = byteArray;
this.manualEvent = manualEvent;
}
}
class Writer
{
static int workItemCount = 0;
Writer() {}
public static void WriteToFile(object state)
{
int workItemNumber = workItemCount;
Interlocked.Increment(ref workItemCount);
Console.WriteLine("Starting work item {0}.",
workItemNumber.ToString());
State stateInfo = (State)state;
FileStream fileWriter = null;
// Create and write to the file.
try
{
fileWriter = new FileStream(
stateInfo.fileName, FileMode.Create);
fileWriter.Write(stateInfo.byteArray,
0, stateInfo.byteArray.Length);
}
finally
{
if(fileWriter != null)
{
fileWriter.Close();
}
// Signal Main that the work item has finished.
Console.WriteLine("Ending work item {0}.",
workItemNumber.ToString());
stateInfo.manualEvent.Set();
}
}
}