c USES filesystemwatcher to monitor file system changes

#region  Monitor folder changes 
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = "f:\\";
            watcher.NotifyFilter =// The aspect being monitored 
               NotifyFilters.LastWrite |
               NotifyFilters.FileName |
               NotifyFilters.DirectoryName;
            //  To subscribe to 1 When it is triggered ( .net(windows) The underlying trigger, we don't care), executes our method 
            watcher.Changed += (object source, FileSystemEventArgs e) =>
            {
                Console.WriteLine(" file {0} Has been modified , Modify the type {1}", e.FullPath, e.ChangeType.ToString());
            };
            watcher.Created += (object source, FileSystemEventArgs e) =>
            {
                Console.WriteLine(" file {0} By establishing ", e.FullPath);
            };
            watcher.Deleted += (object source, FileSystemEventArgs e) =>
            {
                Console.WriteLine(" file {0} Has been deleted ", e.FullPath);
            };
            watcher.Renamed += (object source, RenamedEventArgs e) =>
            {
                Console.WriteLine(" file {0} The name has been removed from {1} Turned out to be {2}", e.OldFullPath, e.OldName, e.Name);
            };
            //  for true According to open FileSystemWatcher Component, otherwise our monitoring will not activate 
            watcher.EnableRaisingEvents = true;
            #endregion

In addition, I want to show you the technique of using an xor xor operation, that is, it can alternate the values of two variables without introducing a third variable. Your variable can be either a value or a character. If it is a character, we need to use its hashcode value for xor operation.

#region xor Exchange of two variables 
            int a = 2;
            int b = 3;
            Console.WriteLine("a={0}", a);
            Console.WriteLine("b={0}", b);
            a = a ^ b ^ (b = a);
            Console.WriteLine("a={0}", a);
            Console.WriteLine("b={0}", b);
            #endregion