file system watcher code

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C#

C#4.0

file

I've been working on this file watcher that will basically run and when if detects an update from this directory "G:\excelsheet\autoupdates" it will copy the new/modified files, and paste a copy into this directory "C:\Importantdocs\pnls". For some reason there is a compile error with respect to the 13 line in the code (bolded). Can someone please help?

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using System.Security.Permissions;

namespace FancyListener
{
    class FileWatcher
    {
        FileSystemWatcher Watcher;
        string Directory ="G:\GMM\Public\FinPro";
        [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
        public FileWatcher(string Directory)
        {
            Watcher = new FileSystemWatcher(Directory);
            Watcher.Path = Directory;
            Watcher.NotifyFilter = NotifyFilters.LastWrite;
            Watcher.Created += new FileSystemEventHandler(OnCreated);
            // Begin watching.
            Watcher.EnableRaisingEvents = true;
            wait();
            
        }
        private void OnChanged(object source, FileSystemEventArgs e)
        {
            // Specify what is done when a file is changed, created, or deleted.
            Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
            int filename_parameter = 1;
            copy(filename_parameter);
            
        }
        private void OnCreated(object source, FileSystemEventArgs e)
        {
            // Specify what is done when a file is changed, created, or deleted.
            Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
            int filename_parameter = 2;
            copy(filename_parameter);
                
        }
        private void wait()
        {
            Console.WriteLine("Waiting");
            while (true)
            {
            }
        }
        public void copy(int testval)
        {

            DateTime valueDate = DateTime.Today.Date;
            string dateString = valueDate.ToString("dd-MM-yyyy");
            string filename_var;
            if (testval == 1)
                 filename_var = "rate_file_changed_" + @dateString;
            else
                 filename_var = "new_rate_file_" + @dateString;
            string fileName = filename_var;
            string sourcePath = @"G:\GMM\Public\FinPro";
            string targetPath =  @"\\eitsvrtwprsvc03.ibg.adroot.bmogc.net\Test_DP$";
            fileName = System.IO.Directory.GetFiles(sourcePath);
            string fileName_start = System.IO.Path.GetFileName(fileName);
            string destFile = System.IO.Path.Combine(targetPath, fileName_start);
            System.IO.File.Copy(fileName_start, destFile, true);
        }
    }
}