C# Readonly function

how do i make a Property in C# readonly ?

I tried to do the C# Property

  public string Title { get;  }
    public  abstract string? Html { get;  }
    public int RatingCount => UserEmail.Count;
    public decimal? AverageRating { get
    {
        decimal sum = UserEmail.Values.Sum();
        return RatingCount > 0 ? (sum / RatingCount) : null;
    }}
    private List<Comment> _comment { get; } = new();
    public IReadOnlyList<Comment> Comments => _comment.AsReadOnly();

    private readonly Dictionary<string, int> UserEmail = new();
    
    public Post(User user, string title)
    {
        uesr = user;
        Title = title;
    }

this is a descrption for what happend

>Solution :

Look at this example, I hope it solves your question:

public class MyClass
{
    private readonly int _myField;

    public MyClass(int myField)
    {
        _myField = myField;
    }

    public int GetMyField()
    {
        return _myField;
    }
}