Cannot implicitly convert type 'customtype' to 'othercustomtype'

Question

I am new to C#. I have a Persons class and a User class which inherits from the Persons class. I my console I input a users in an array. Then I can add a note to a user that

Answer 1

Anyway, I recommend to use LINQ extension method for your first method:

using System.Collections.Generic;
using System.Linq;

public static Persons FindPerson(IEnumerable persons, int id)
{
    return persons.FirstOrDefault(p => p.ID == id);
}

Looks much better, right?