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   string filepath = FileUpload1.FileName;                                                         //  µÃµ½ÎļþµÄÍêÕû·¾¶
   string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);            //  µÃµ½ÎļþÃû£¨¼´È¥µôÁË·¾¶£©
   string type = filename.Substring(filename.LastIndexOf("."));                       //  µÃµ½ÎļþµÄÀàÐÍ(´ø . )
   string newname = DateTime.Now.ToString("yyyyMMddHHmmss") + type;   //  ½«µ±Ç°µÄʱ¼ä¸ñʽ»¯×÷ΪÎļþµÄÐÂÃû×Ö
   string serverpath = Server.MapPath("~/upimages/") + newname;              // ¹¹³ÉÎļþµÄ´æ´¢Â·¾¶£¨ÕâÊÇÕæʵ·¾¶£©
   FileUpload1.PostedFile.SaveAs(serverpath);                                                //  ´æ´¢Îļþ