Implementing Interface

//In IAutomobile.cs file
using System;

namespace LearnInterfaces
{
  interface IAutomobile
  {
    string LicensePlate { get; }
    double Speed { get; }
    int Wheels { get; }
    void Honk();
  }
}

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//In Sedan.cs
using System;

namespace LearnInterfaces
{
  class Sedan : IAutomobile
  {
    //must include public keyword
    public string LicensePlate { get; }
    public double Speed { get; }
    public int Wheels { get; }
    //define the method
    public void Honk(){
      Console.WriteLine("HONK!");
    }
  }
}