public static void FixInvalidHighResUri() { MarbleDataBase db = new MarbleDataBase(); var allImages = from image in db.Imagedata select image; foreach (ImageData iData in allImages) { if (!doesUriExist(iData.Highresurl)) { Console.WriteLine("HighRes url doesn't exist: " + iData.Highresurl); iData.Highresurl = iData.Lowresurl; } } db.SaveChanges(); Console.WriteLine("Saved changes from UriChecker"); }