c# - what's the difference between inheritance and polymorphism?

Question

can you give me a simple example of inheritance and polymorphism, so it could be fully clear and understandable?

using C# would make it more clear, as I already learned it.

P.S: the tutors, books we've got are in native language, (arabic)

sorry if that question seemed so easy, even silly on you guys, but these concepts are considered hard; if you don't fully understand them, then you fail.

Answer 1

This is polymorphism:

public interface Animal 
{
  string Name { get; }
}

public class Dog : Animal
{
  public string Name { get { return "Dog"; } }
}

public class Cat : Animal
{
  public string Name { get { return "Cat"; } }
}

public class Test 
{
  static void Main()
  {
      // Polymorphism
      Animal animal = new Dog();

      Animal animalTwo = new Cat();

      Console.WriteLine(animal.Name);
      Console.WriteLine(animalTwo.Name);
  }
}

this is Inheritance:

public class BaseClass
    {
        public string HelloMessage = "Hello, World!";
    }

    public class SubClass : BaseClass
    {
        public string ArbitraryMessage = "Uh, Hi!";
    }

    public class Test
    {
        static void Main()
        {
            SubClass subClass = new SubClass();

            // Inheritence
            Console.WriteLine(subClass.HelloMessage);
        }
    }