c# text based game random generator [duplicate]

This question already has an answer here:

• Random number generator only generating one random number 8 answers

im trying to learn c# and slowly trying to create my own code but i have a bit of a problem with the random number generator it keeps giving me the same number all the time instead of different ones. warning the code i wrote is pretty newbie so yeah... still learning. much help would be appreciated

        Random random = new Random();



       lvl = random.Next(1, 11);

        switch (lvl)
        {
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
                hitpoints = random.Next(10, 50);
                xp = random.Next(1, 5);
                damage3 = random.Next(1, 5);
                break;
            case 6:
            case 7:
            case 8:
            case 9:
            case 10:
                hitpoints = random.Next(50, 110);
                xp = random.Next(5, 11);
                damage3 = random.Next(5, 11);
                break;
            default:

                break;

        }
        if (hitpoints == 0)
        {
            character tom = new character();
            Console.WriteLine("You have defeated the monster");
            tom.xp = +xp;
            return;

        }
        }

    } 



}