using System;
using System.Collections.Generic;
using System.Linq;
    
public class Province
{
    public string province { set; get; }
    public Nullable<int> provinceCode { set; get; }
}
    
public class Zone
{
    public string CityCode { get; set; }
    public string City { get; set; }
    public string Province { get; set; }
    public Nullable<int> ProvinceCode { get; set; }
}

public class ZoneTest
{
	public static void Main()
	{
	    List<Zone> ZoneList = new List<Zone>();
	
	    Zone newZone = new Zone()
	                   {
	               	        CityCode = "citycode1",
	               	        City = "city1",
	               	        Province = "province1",
	               	        ProvinceCode = 1
	                   };
	                
	    ZoneList.Add(newZone);
	    
	    newZone = new Zone()
	                   {
	               	        CityCode = "citycode2",
	               	        City = "city2",
	               	        Province = "province2",
	               	        ProvinceCode = 2
	                   };
	                
	    ZoneList.Add(newZone);
	    
	    newZone = new Zone()
	                   {
	               	        CityCode = "citycode2",
	               	        City = "city2",
	               	        Province = "province2",
	               	        ProvinceCode = 2
	                   };
	                
	    ZoneList.Add(newZone);
	
	    Console.WriteLine(ZoneList[0].ProvinceCode);
	    Console.WriteLine(ZoneList[1].ProvinceCode);
	    Console.WriteLine(ZoneList[2].ProvinceCode);
	   
	   	List<Province> ListZoneWithDistinct = ZoneList.GroupBy(x => new {x.Province, x.ProvinceCode}).Select(grp => new Province() {province = grp.First().Province, provinceCode = grp.First().ProvinceCode}).ToList();
                                      
	    Console.WriteLine("Count after Distinct: " + ListZoneWithDistinct.Count);
	    Console.WriteLine(ListZoneWithDistinct[0].provinceCode);
	    Console.WriteLine(ListZoneWithDistinct[1].provinceCode);
	}
}