How to implement smart "enums" (like in Java) in C#

SmartEnum.cs

public abstract class SmartDayOfTheWeek
{
    public static SmartDayOfTheWeek Monday { get; } = new Monday();
    public static SmartDayOfTheWeek Tuesday { get; } = new Tuesday();
    // Etc...
    
    public static IEnumerable<SmartDayOfTheWeek> Days
    {
        get
        {
            yield return Monday;
            yield return Tuesday;
            // Etc...
        }
    }
    
    public abstract string Name { get; }
    public abstract int Number { get; }
    
    private SmartDayOfTheWeek()
    { }
    
    private sealed class Monday
    {
        public override string Name { get; } = "Monday";
        public override int Number { get; } = 0;
    }
    
    private sealed class Tuesday
    {
        public override string Name { get; } = "Tuesday";
        public override int Number { get; } = 1;
    }
    
    // Etc...
}