删除物料信息时要把其所在文件夹中的图片删除

                    string imagePath = Server.MapPath("~/ProImage/") + drResult["kp_url"].ToString().Trim();

                   int a = imagePath.Substring(imagePath.LastIndexOf("//")).Trim().Length; //此处用来判断该物料是否有图片，否则从服务器删除空文件会报错
                    if (a > 1)
                    {
                        System.IO.File.Delete(imagePath);
                    }
                   // if (imagePath.Trim().Length > 0)
                    //{
                        //删除文件
                       // File.Delete(imagePath);
                    //}
                    dt.Rows.Find(e.CommandArgument.ToString()).Delete();