using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public interface IRule<TEntity>:where TEntity is 

{

    bool Valid(TEntity entity);

}

​

public class Employee : IEntity

{

} 

​

public interface IEntity

{

} 

​

public class AgeRule : IRule<Employee>

{

    public bool Valid(Employee employee) 

    {

        return true;

    } 

}