Hjälp med en programmeringsuppgift c#

private void textBoxInput_TextChanged(object sender, EventArgs e)
        {
            string userInput = textBoxInput.Text;
            if (userInput == "stolle")
            {
                ListPets[0].Interact();              
            }
            else if (userInput == "alfons")
            {
       
            }
        }

public override string Interact()
        {
            string fetch = "You are playing fetch with Stolle";
            return fetch;
        }

namespace JOPPESHUNDARV1
{
    public partial class Form1 : Form
    {
        private List<Animal> ListPets = new List<Animal>(); 
        
        public Form1()
        {
            InitializeComponent();
            ListPets.Add(new Cat("Stolle", 1));
            ListPets.Add(new Dog("Alfons", 2));
            ListPets.Add(new Puppy(5, "Pajas", 0));
            
        }

        private void textBoxInput_TextChanged(object sender, EventArgs e)
        {
            string userInput = textBoxInput.Text;
            if (userInput == "stolle")
            {
                ListPets[0].Interact();
                //labelInfo.Text = "You are playing with Stolle";
            }
            else if (userInput == "alfons")
            {

                //labelInfo.Text = "You are playing with Alfons";
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void buttonList_Click(object sender, EventArgs e) //listar djuren
        {
            textBoxResult.Clear();
            labelInfo.Text = "Here are your list of all available animals";
            ListAnimals();
        }

        private void buttonPlay_Click(object sender, EventArgs e) //Play Fetch knappen
        {
            textBoxResult.Clear();
            label2.Text = "Which animal do you want to play with?";
            textBoxInput_TextChanged(sender, e);
        }

        private void buttonFeed_Click(object sender, EventArgs e) //Feed knappen
        {
            textBoxResult.Clear();
            label2.Text = "Which animal do you want to feed?";

        }

        private void labelInfo_Click(object sender, EventArgs e)
        {

        }
        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        public void ListAnimals()
        {
            foreach (Animal animal in ListPets)
            {
                textBoxResult.AppendText(Text = "\r\n" + animal.Name);
            }
        }

        private void buttonEnter_Click(object sender, EventArgs e)
        {
            
        }
    }

    class Petowner
    {
        public Petowner()
        {
        }
    }

    abstract class Animal
    {
        protected int Age { get; set; }
        public string Name { get; set; }
        protected string FavFood { get; set; }
        protected string Breed { get; set; }
        protected bool Hungry { get; set; }

        public virtual string Interact()
        {
            string fetch = "You are playing with animal";
            return fetch;
        }

        public virtual void Eat(string inFood)
        {
        }

        public virtual void HungryAnimal()
        {
        }
    }

    
    class Cat : Animal
    {
        public Cat(string inName, int inAge)
        {
            this.Name = inName;
            this.Age = inAge;
            this.Breed = "Mixed race";
            this.FavFood = "Mouse";
        }
        public override string Interact()
        {
            string fetch = "You are playing fetch with Stolle";
            return fetch;
        }

        public override void HungryAnimal()
        {

        }
    }

    
    class Dog : Animal
    {
        
        public Dog(string inName, int inAge)
        {
            this.Name = inName;
            this.Age = inAge;
            this.FavFood = "Chicken";
            this.Breed = "Finnish Lapphund";
        }

        public override string Interact()
        {
            string fetch = "You are playing fetch with Alfons";
            return fetch;
        }
    }

    
    class Puppy : Dog
    {
        protected int Months { get; set; }

        public Puppy(int months, string inName, int inAge) : base(inName, inAge)
        {
            this.Months = months;
        }

        public override string Interact()
        {
            string fetch = "You are playing fetch with Pajas";
            return fetch;
        }
    }
}

public override string Interact()
        {
            labelInfo.Text = "You are playing with Stolle";
        }