求助 asp.net 实现下载功能，数据库中文件路径为绝度路径，如何实现下载

string filePath = Server.MapPath(myPicture.Paths);//myPicture.Paths是数据库中的路径

            if (System.IO.File.Exists(filePath))
            {
                System.IO.FileInfo file = new System.IO.FileInfo(filePath);
                Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); 
                Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(file.Name));   
                Response.AddHeader("Content-length", file.Length.ToString());
                Response.ContentType = "appliction/octet-stream";
                Response.WriteFile(file.FullName);
                Response.End();



错误   E:\Pictures\Love\1.jpg不是有效的虚拟路径 ASP.NET

补充：.NET技术 ,  C#