using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public class BaseEntity

    {

        public string Id {get; set;}

    }

    public class Subject : BaseEntity

    {

        public string Name {get; set;}  

    }

    public class Read<T> where T : BaseEntity //, new()

    {

        public T Entity { get; set;}

        public void Execute()

        {

            var repository = new Repository();

            repository.Read(Entity);

        }

    }

    public class Repository

    {

        public T Read<T>(T entity) where T : BaseEntity , new() 

        {

            return new T();

        }

    }

}