FileSystemWatcher is not hitting the breakpoint while debugging in C#

Question

I have a method which contains FileSystemWatcher to watch any changes in the text file.Here is my method.

public static void RunWatcher()
{
    FileSystemWatcher watcher = new FileSystemWatcher();
    watcher.Path = "D:\\CDR File";
    watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
               | NotifyFilters.FileName | NotifyFilters.DirectoryName;
    watcher.Filter = "*.txt";
    watcher.Changed += new FileSystemEventHandler(OnChanged);
    watcher.EnableRaisingEvents = true;
}

And here is my method which is called from RunWatcher() method..

private static void OnChanged(object source, FileSystemEventArgs e)
{
    int totalLines = File.ReadLines(FileToCopy).Count();
    int newLinesCount = totalLines - ReadLinesCount;
    File.ReadLines(FileToCopy).Skip(ReadLinesCount).Take(newLinesCount);
    ReadLinesCount = totalLines;

    Console.WriteLine("Hello World");
    Console.ReadLine();
}

Now i have called RunWatcher() method in the main method of the application and put a breakpoint inside RunWatcher() method.But on debugging i am not able to call OnChanged ..what is the problem ?why is it not getting debugged and hitting the braekpoint?

Here is what i have tried as per suggestion from Hans Passant

        string FileToCopy = "D:\\BEML.txt";

        if (System.IO.File.Exists(FileToCopy) == true)
        {
            var fs = new FileStream(FileToCopy, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            using (var reader = new StreamReader(fs))
            {
                string line;
                string rawcdr;

                while ((line = reader.ReadLine()) != null)
                {
                }
            }
          }

Answer 1

OnChanged is not called from RunWatcher. The calling of eventhandlers are handled in the background by the runtime. So you need to set the breakpoint in OnChanged.