1. In order to assign the argument values to the fields without raising any error you'll have to use this operator, since the arguments are the same name as the fields.

        using System;

        class Dog {
            public string name;
            public string breed;
            public int age;
            
            // Write constructor code below this line
            public Dog(string name, string breed, int age) {
                this.name = name;
                this.breed = breed;
                this.age = age;
            }
            // Write constructor code above this line
            
            public void bark() {
                Console.WriteLine("Woof!");
            }
        }
        
        public class ConsoleApp
        {
            public static void Main(string[] args)
            {
                Dog dog = new Dog("Dobby", "Dobermann", 4);
                dog.bark();
            }
        }