将一个对象的值存储到一个新对象中，它们是否共享相同的值

所以在过去的几个月里我一直在自学c#，并决定做一个项目，看看我能用我所学到的东西做些什么。

我的问题是。这个新的Person selectedPerson是存储在新内存中的新对象，还是whoosbuying()方法中返回的Person [i]的引用。基本上我问的是，它们是否共享相同的属性，如果我更新一个它会更新另一个或它们是不同的对象吗，

//Chose the person whos buying something and save into selectedPerson
Person selectedPerson = new Person();
selectedPerson = selectedPerson.WhosBuying(person);
    public Person WhosBuying(List<Person> person)
    {
        StringBuilder buyer = new StringBuilder();
        buyer.Append("Who's Buying? ");
        //Loop through all persons: (1)person[0].Name (2)person[1].Name
        int i = 1;
        foreach (var p in person)
        {
            buyer.Append("(" + (i) + ")" + p.Name + " ");
            i++;
        }
        Console.WriteLine(buyer);
        string buying = Console.ReadLine();
        //Store the person buying into selectedPerson 
        //by returning the person selected by user input
        for (int x = 1; x < person.Count + 1; x++)
        {
            if (int.Parse(buying) == x)
                return person[x - 1];
        }
        return null;
    }