小弟是初学者，下面是学习文件和流的程序，问题：

　　当运行到Directory.Delete(path)时，报错 "The process cannot access the file 'C:\\My Folder2' because it is being used by another process."  可我没有找到其他程序在使用此文件，是不是某个潜在的进程在使用此文件？请高手赐教。

 public static void test()
        {
            string path = "C:\\My Folder";
            try
            {
                if (!Directory.Exists(path))
                {
                    //---创建目录及其子目录---
                    Directory.CreateDirectory(path);
                    Directory.SetCurrentDirectory(path);
                    Directory.CreateDirectory("Subdir1");
                    Directory.CreateDirectory("Subdir2");
                    Directory.CreateDirectory("Subdir3");
                }
                Directory.SetCurrentDirectory(path);
                //---打印目录信息---
                Console.WriteLine("当前工作目录："+Directory.GetCurrentDirectory());
                Console.WriteLine("创建时间："+Directory.GetCreationTime(path));

                DirectoryInfo parent = Directory.GetParent(path);
                if (parent.Exists)
                {
                    Console.WriteLine("父目录信息：");
                    Console.WriteLine("    "+parent.FullName);
                    Console.WriteLine("    "+parent.CreationTime);
                    Console.WriteLine("    "+parent.CreationTimeUtc);
                }
                //---打印子目录名称---
                string[] subDirs = Directory.GetDirectories(path);
                Console.WriteLine("子目录：");
                foreach (string subDir in subDirs)
                {
                    Console.WriteLine("   " + subDir);
                }
                //---删除所有目录---
                foreach(string str in Directory.GetDirectories(path))
                {
                    Directory.Delete(str);
                }
                Directory.Delete(path);
            }
            catch (System.IO.IOException ex)
            {
             Console.WriteLine(ex.Message);
            }
            catch (System.Exception ex)
            {
             Console.WriteLine(ex.Message);
            }
           
        }