using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using System.Linq;

public class Principal

{

    public string Name { get; set; } 

    public int? PercentOwned {get; set;}

    public bool IsPrimary {get; set; }

}

​

public class PercentOwnerPrimaryContactComparer : IComparer<Principal>

{

        public int Compare(Principal x, Principal y)

        {

            if (x == null && y == null)

                return 0;

            if (x == null)

                return -1;

            if (y == null)

                return 1;

​

            if (x.PercentOwned < y.PercentOwned)

                return -1;

            if (x.PercentOwned > y.PercentOwned)

                return 1;

            // Equal put primary contact ahead if either one is the primary contact

            return (!x.IsPrimary && !y.IsPrimary) ? 0 : x.IsPrimary ? 1 : -1;

        }

}

public class Program

{

    public static void Main()

    {       

        var sortedIndividuals = new List<Principal>();

        sortedIndividuals.Add(new Principal { Name = "Bob1", PercentOwned = 70, IsPrimary = false });

        sortedIndividuals.Add(new Principal { Name = "Bob2", PercentOwned = 60, IsPrimary = false });

        sortedIndividuals.Add(new Principal { Name = "Bob3", PercentOwned = 60, IsPrimary = false });

        sortedIndividuals.Add(new Principal { Name = "Bob4", PercentOwned = 60, IsPrimary = true });

        sortedIndividuals.Add(new Principal { Name = "Bob5", PercentOwned = 50, IsPrimary = false });

        sortedIndividuals.Add(new Principal { Name = "Bob6", PercentOwned = 50, IsPrimary = false });

        sortedIndividuals.Add(new Principal { Name = "Bob7", PercentOwned = 20, IsPrimary = false });

   var sorted = sortedIndividuals

            .OrderByDescending(i => i, new PercentOwnerPrimaryContactComparer())

            .ThenBy(i => i.Name).ToList();     

        Console.WriteLine(JsonConvert.SerializeObject(sorted));

    }

}