How to get Full size Image url after upload on Picasa

 Uri postUri = new Uri(PicasaQuery.CreatePicasaUri(username, "xxxx"));              
                System.IO.FileInfo fileInfo = new System.IO.FileInfo(file);
                System.IO.FileStream fileStream = fileInfo.OpenRead();
                PicasaEntry entry = (PicasaEntry)service.Insert(postUri, fileStream, "image/jpeg", file);
                fileStream.Close();