public int UploadFiles(FileUpload FileUpload1, string path, string fileName)
        {
            Boolean fileOk = false;
            //string path = Server.MapPath("~/Files/");

            //判断是否已经选取文件
            if (FileUpload1.HasFile)
            {
                //取得文件的扩展名,并转换成小写
                string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();

                
                //直接允许文件类型
                fileOk = true;

                if (fileOk)
                {
                    try
                    {
                        FileUpload1.PostedFile.SaveAs(path + fileName);

                        
                        return 1;
                    }
                    catch
                    {
                        return -1;
                    }
                }
            }

            //未选择文件或者文件格式不正确
            return 0;
        }