System.Collections.ListDictionaryInternal Error

我试图创建一个程序，每次我创建一个文本文件，它会压缩文件并记录它。它适用于第一个文本文件，但当我创建第二个文本文件，我得到这个异常:System.Collections.ListDictionaryInternal

Error:The process cannot access the file 'D:'TemeC#'FilesHomework'FilesHomework' obj'Debug'New Text Document.txt' because it is being used by another process.

这是我的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.IO.Compression;
using System.Security.Permissions;
namespace FilesHomework
{
    class Program
    {
        static void Main(string[] args)
        {
            Run();
        }
        [PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
        public static void Run()
        {
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = "D:";
            watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;
            watcher.Filter = "*.txt";
            watcher.Created += new FileSystemEventHandler(OnChanged);
            watcher.EnableRaisingEvents = true;
            Console.WriteLine("Press ''q'' to quit the sample.");
            while (Console.Read() != 'q') ;
        }
        private static void OnChanged(object source, FileSystemEventArgs e)
        {
            try {
                FileInfo FileIn = new FileInfo(e.Name);
                Compress(FileIn);
                // FileStream LogFile = File.Open("LogFile.txt",FileMode.OpenOrCreate,FileAccess.ReadWrite,FileShare.ReadWrite);
                //  File.SetAttributes("LogFile.txt", FileAttributes.Normal);
                //  StreamWriter sw = new StreamWriter(LogFile);
                string str;
                str = ("The file " + e.Name + " has been deleted at  " + DateTime.Now);
                // byte[] b1 = System.Text.Encoding.UTF8.GetBytes(str);
                //  sw.WriteLine(str);
                Console.WriteLine(str);
                File.Delete(e.Name);

                //  LogFile.Close();
                //    sw.Close();
            }
            catch(Exception er)
            {
                Console.WriteLine("Error:" + er.Data);
            }

        }
        public static void Compress(FileInfo fileSelected)
        {
            using (FileStream originalFileStream = fileSelected.OpenRead())
            {
                if ((File.GetAttributes(fileSelected.FullName) &
                   FileAttributes.Hidden) != FileAttributes.Hidden & fileSelected.Extension != ".gz")
                {
                    using (FileStream compressedFileStream = File.Create(fileSelected.Name+ ".gz"))
                    {
                        using (GZipStream compressionStream = new GZipStream(compressedFileStream,
                           CompressionMode.Compress))
                        {
                            originalFileStream.CopyTo(compressionStream);

                        }
                    }
                }

            }
        }
    }
}