using System;

using System.Collections.Generic;

​

public interface IBase

{

    void DoSomething();

}

​

public class Class1 : IBase

{

    public string Name { get; set; }

    public int Age { get; set; }

​

    public void DoSomething()

    {

        Console.WriteLine($"{Name} ({Age} years)");

    }

}

​

public class Class2 : IBase

{

    public string Name { get; set; }

​

    public void DoSomething()

    {

        Console.WriteLine(Name);

    }

}

​

// Other Class* classes

public class Program

{

    public static void Main()

    {

        List<IBase> entries = new()

        {

            new Class1 { Name = "Sarah", Age = 43 },

            new Class2 { Name = "Peter" }

        };

​

        foreach (var entry in entries)

        {

            entry.DoSomething();

        }

    }

}

​