帮忙搞定下，低级错误，谢谢！

Question

   大家好，我是个初学者，我刚输入的文件监控窗体程序有两个错误，不知道怎么解决，哪位有空提示下，程序如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;namespace FileWhatchTest
{
    public partial class Form1 : Form
    {
        private FileSystemWatcher watcher;
        private delegate void FileWatchDelegate(string newFile);
               public Form1()
        {
            InitializeComponent();
            this.watcher = new System.IO.FileSystemWatcher();
            this.watcher.Renamed += new System.IO.RenamedEventHandler (this.OnRenamed);
            this.watcher.Changed += new System.IO.FileSystemEventHandler (this.OnChanged);
            this.watcher.Created += new System.IO.FileSystemEventHandler(this.OnCreate);
            this.watcher.Deleted += new System.IO.FileSystemEventHandler(this.OnDelete);
            DirectoryInfo aDir = new DirectoryInfo(@"c:\FileWatchTest");
            if (!aDir.Exists)
            {
                aDir.Create();
            }
        }
        public void OnChanged(object soure, FileSystemEventArgs e)
        {
            try
            {
                StreamWriter sw = new StreamWriter(@"c:\fileWatchTest\test5.txt", true);
                sw.WriteLine("File{0} {1}", e.FullPath, e.ChangeType.ToString());
                sw.Close();
                this.BeginInvoke(new FileWatchDelegate(FileWatch)//错误地方//, "Wrote delete event to log");
            }
            catch (IOException)
            {
                lbWatch.Items.Add("文件改变失败".ToString());
            }
        }        public void OnRenamed(object soure, RenamedEventArgs e)
        {
            try
            {
                StreamWriter sw = new StreamWriter(@"c:\fileWatchTest\test5.txt", true);
                sw.WriteLine("File Rename from{0}to{1}", e.OldName, e.FullPath);
                sw.Close();
                this.BeginInvoke(new FileWatchDelegate(FileWatch)//错误地方//, "Wrote delete event to log");
            }
            catch (IOException)
            {
                lbWatch.Items.Add("文件重命名失败".ToString());
            }
        }
        public void OnDelete(object soure, FileSystemEventArgs e)
        {
            try
            {
                StreamWriter sw = new StreamWriter(@"c:\fileWatchTest\test5.txt", true);
                sw.WriteLine("File{0} delete", e.FullPath);
                sw.Close();
                this.BeginInvoke(new FileWatchDelegate(FileWatch)//错误地方//, "Wrote delete event to log");
            }
            catch (IOException)
            {
                lbWatch.Items.Add("文件删除失败".ToString());
            }
        }        public void OnCreate(object soure, FileSystemEventArgs e)
        {
            try
            {
                StreamWriter sw = new StreamWriter(@"c:\fileWatchTest\test5.txt", true);
                sw.WriteLine("File{0} create", e.FullPath );
                sw.Close();
                this.BeginInvoke(new FileWatchDelegate(FileWatch)//错误地方//, "Wrote delete event to log");
            }
            catch (IOException)
            {
                lbWatch.Items.Add("文件创建失败".ToString());
            }
        }        private void btnBrowse_Click(object sender, EventArgs e)
        {
            if (fOpen.ShowDialog() == DialogResult.OK)
            {
                tbLocation//错误地方//.Text = fOpen.FileName;
                btnWatch.Enabled = true;
            }
        }        private void btnWatch_Click(object sender, EventArgs e)
        {
            watcher.Path = Path.GetDirectoryName(tbLocation//错误地方//.Text);
            watcher.Filter = Path.GetFileName(tbLocation错误地方//.Text);
            watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.Size;
            lbWatch .Items .Add ("监测到".ToString ()+ tbLocation//错误地方//.Text);
            watcher .EnableRaisingEvents =true ;
        }        private void btnClose_Click(object sender, EventArgs e)                                                             
        {
            this.Close();
        }      
        
    }
}
       系统说：Error 2 The name 'FileWatch' does not exist in the current context D:\My Documents\Visual Studio 2008\Projects\FileWatchTest\FileWatchTest\Form1.cs 57 56 FileWatchTest
       不知道怎么解决，希望高手们指点。