public static void UpdateDriver(string drivingLicenseNumber, string country, string city, string address, short pointsLeft, string drivingCategories, short?role, string pictureLocation)
        {
            UsersDataClassesDataContext userDataContext = new UsersDataClassesDataContext();
            Driver driver = driverDataContext.Drivers.Where <Driver>(anonymous => anonymous.DrivingLicenseNumber == drivingLicenseNumber).Single();
            User   user   = userDataContext.Users.Where <User>(anonymous => anonymous.DrivingLicenseNumber == drivingLicenseNumber).Single();

            driver.Country           = country;
            driver.City              = city;
            driver.Address           = address;
            driver.DrivingPointsLeft = pointsLeft;
            driver.DrivingCategories = drivingCategories;
            driver.PictureLocation   = pictureLocation;
            user.Role_ = role;

            driverDataContext.SubmitChanges();
            userDataContext.SubmitChanges();
        }