string Name { get; set; }
public interface IEmployee
double TotalSalary { get; set; }
public class Employee : IEmployee, IPerson
public string Name { get; set; }
public double TotalSalary { get; set; }
public bool IsOlderThan50()
public double CalculateMonthlySalary()
public static void Main()
Employee e1 = new Employee();
Console.WriteLine("Is {0} older than 50? {1}", e1.Name, e1.IsOlderThan50());
Console.WriteLine("{0}'s month salary equals to {1}", e1.Name, e1.CalculateMonthlySalary());