web中的代码：

//PhotoName是从数据库中读出的图片的虚拟路径，将其转化成物理路径

//PhotoName 原为 “tb/070813/14/0708131439164876_71863.jpg“,Server.MapPath

//转化后变成了D:\ASsoft\ClearnWeb\tb\070813\14\0708131439164876_71863.jpg

　　　　　　　　string PhotoURL = Server.MapPath(PhotoName);
                        FileInfo file = new FileInfo(PhotoURL);
                        if (file.Exists)
                        {
                            try
                            {
                                file.Delete();
                            }
                            catch (Exception exp)
                            {
                                ErrorMessage = exp.Message;
                                strMess.Append(ErrorMessage);
                                strMess.Append("<br>");
                            }
                        }

form中有什么方法可以替代Server.MapPath()???

请帮忙解答。。。