using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

​

        var orders = new List<OrderModel>{

            new OrderModel(){ StyleCode="Nice", ColorCode="Blue", Size="NoSz", OrderQuantity=1 },

            new OrderModel(){ StyleCode="Ok", ColorCode="Blue", Size="NoSz", OrderQuantity=1 },

            new OrderModel(){ StyleCode="Nice", ColorCode="Blue", Size="NoSz", OrderQuantity=1 },

            new OrderModel(){ StyleCode="Nice", ColorCode="Blue", Size="NoSz", OrderQuantity=1 },

            new OrderModel(){ StyleCode="Nice", ColorCode="Blue", Size="NoSz", OrderQuantity=1 },

            new OrderModel(){ StyleCode="Nice", ColorCode="Blue", Size="NoSz", OrderQuantity=1 }

        };

        var scList = orders.Select(x => new { x.StyleCode, x.ColorCode }).Distinct().ToList();

        foreach(var sc in scList){

            Console.Write("StyleCode: " + sc.StyleCode);

            Console.WriteLine(", ColorCode: " + sc.ColorCode);

        }

    }

    public class OrderModel

    {

        public string StyleCode { get; set; }

        public string ColorCode { get; set; }

        public string Size { get; set; }

        public int OrderQuantity { get; set; }

    }

}

//-- StyleCode

//-- 1000327384

//-- 1000046380

​

//-- ColorCode

//-- 001

//-- 005

//-- 443

​

//-- Size

//-- NoSz

//-- L