static void Main(string[] args) { // create a lab // count 1 to 10 // create Rabbits // name = "Rabbit" + 0 + i Rabbit01, Rabbit02, // age = i // add to list of rabbits // print out list at end for (int i = 0; i < 10; i++) { var r = new Rabbit(); r.age = i; //r.name = $"Rabbit0{i}"; if (i < 10) { r.name = $"Rabbit0{i}"; } else { r.name = $"Rabbit{i}"; } rabbits.Add(r); } // for each }