Discussion on: 6 Options to Implement Auto-Implemented Properties

[Zohar Peled]

Using private set doesn't mean the property can only be set via the constructor. It can be set from anywhere inside the instance. This is still a mutable property, only you now have full control over its set calls:

public class Person
{
    public string Name {get; private set;}
    public void ChangeName(string newName) => Name = newName;
}

If you want an immutable property, you can use a get-only property (meaning it has to be initialized either directly or from a constructor) or a get/init property (so it can also be initialized from object initialization:

public class Person
{
    public Person(string firstName) => FirstName = firstName;
    public string FirstName {get;}
    public string MiddleName {get;} = "";
    public string LastName {get;init;}
}

var me = new Person("Zohar") {LastName = "Peled"};