Refactoring If-Else to Value Object

ValueObjectApproach.cs

//If-Else Approach
public class User
{
    public string Name { get; set; }
    public string Email { get; set; }

    public void ChangeEmail(string email)
    {
        if (!IsEmailValid(email))
            throw new ArgumentException("{email} is not valid.", email);

        Email = email;
    }

    private bool IsEmailValid(string email)
    {
        try
        {
            var mail = new MailAddress(email);
            return true;
        }
        catch (FormatException)
        {
            return false;
        }
    }
}

//Value Object Approach
public class UserEmail
{
    public string Email { get; private set; }

    public UserEmail(string email)
    {
        if (!IsEmailValid(email))
            throw new ArgumentException("{email} is not valid.", email);

        Email = email;
    }

    private bool IsEmailValid(string email)
    {
        try
        {
            var mail = new MailAddress(email);
            return true;
        }
        catch (FormatException)
        {
            return false;
        }
    }
    
    /* Equals and GetHashCode should be overridden to ensure structural equality. */
}

public class User
{
    public string Name { get; set; }
    public UserEmail UserEmail { get; private set; }

    public void ChangeEmail(UserEmail userEmail)
    {
        UserEmail = userEmail;
    }
}