You can register to be informed of any changes in the windows file system. You can filter based on a filename, or type of event such as delete create, modify.

C# Code

Add the following include: 

using System.IO;

Create a windows application and in a form place this code in the Form Load event: 

FileSystemWatcher fsw = new FileSystemWatcher();
fsw.Path = "c://";
fsw.Filter = "*.*";
fsw.NotifyFilter = NotifyFilters.LastAccess | 
                      NotifyFilters.LastWrite | 
                      NotifyFilters.FileName | 
                      NotifyFilters.DirectoryName;	

//Setup Events
fsw.Changed += new FileSystemEventHandler(FileChanged);
fsw.Created += new FileSystemEventHandler(FileCreated);
fsw.Deleted += new FileSystemEventHandler(FileDeleted);
fsw.Renamed += new RenamedEventHandler(FileRenamed);

//Start
fsw.EnableRaisingEvents = true;

Add these methods to the forms as well: 

public static void FileChanged(object source, FileSystemEventArgs e)
{			
    Console.WriteLine("File {0} was Changed.",e.FullPath);
}

public static void FileCreated(object source, FileSystemEventArgs e)
{			
    Console.WriteLine("File {0} was Created.",e.FullPath);
}

public static void FileDeleted(object source, FileSystemEventArgs e)
{			
    Console.WriteLine("File {0} was Deleted.",e.FullPath);
}

public static void FileRenamed(object source, RenamedEventArgs e)
{
    Console.WriteLine("File {0} was renamed to {1}", e.OldFullPath, e.FullPath);
}

Running the Example

Run your application and ensure you can see the Ouput window to view the console.write messages. Then create a new file in c:/, you will notice a message get sent to the console. Then delete the file and you will get another message. C# makes it easy to capture events from the OS like this, perfect for monitoring