static void Main(string[] args) { StudentBuilder sb = new StudentBuilder(); Student oneParameter = sb.WithName("Marie").Build(); Student twoParameter = sb.WithName("Jonh").WithAge(25).Build(); Student threeParameter = sb.WithName("Jonh").WithAge(25).WithBithdayDate(new DateTime()).Build(); Console.WriteLine($"oneParameter => {oneParameter}"); Console.WriteLine($"twoParameter => {twoParameter}"); Console.WriteLine($"threeParameter => {threeParameter}"); }