Sorting.cs

using System;

namespace ConsoleApp5
{
    public class Sorting
    {
        public string Name { get; }

        private Sorting(string name)
        {
            Name = name;
        }

        public static Sorting By(string name)
        {
            return new Sorting(name);
        }

        public static readonly Sorting Default = Sorting.By("Id");
        public override int GetHashCode()
        {
            return this.Name.GetHashCode();
        }

        public override bool Equals(object obj)
        {
            if (obj is Sorting)
                return this == (Sorting)obj;
            return base.Equals(obj);
        }

        public static bool operator ==(Sorting a, Sorting b)
        {
            if (ReferenceEquals(a, null) && string.IsNullOrWhiteSpace(b.Name))
                return true;

            if (ReferenceEquals(b, null) && string.IsNullOrWhiteSpace(a.Name))
                return true;

            return string.Equals(a.Name, b.Name);
        }

        public static bool operator !=(Sorting a, Sorting b)
        {
            return !(a == b);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var a = Sorting.By("Name") ?? Sorting.By("UploadedDate");
            Console.WriteLine(a.Name);

            var b = Sorting.Default ?? Sorting.By("UploadedDate");
            Console.WriteLine(b.Name);

            var c = null ?? Sorting.By("UploadedDate");
            Console.WriteLine(c.Name);

            Console.ReadLine();
        }
    }
}