Using Value Objects to represent technical concerns

1.cs

public class Customer
{
    public string Name { get; set; }
    public string Email { get; set; }
}

Customer customer = GetCustomer();
customer.Name = customer.Email; // Compiles perfectly

2.cs

public class Customer
{
    public Optional70LimitedString Name { get; set; }
    public Optional70LimitedString Email { get; set; }
}

Customer customer = GetCustomer();
customer.Name = customer.Email; // Compiles perfectly

3.cs

public class Customer
{
    public CustomerName Name { get; set; }
    public Email Email { get; set; }
}

Customer customer = GetCustomer();
customer.Name = customer.Email; // Doesn't compile