How to Remove Duplicate Value from Comma Separated String

using System;
using System.Collections.Generic;
using System.Linq;

namespace TestSample
{
    class Program
    {
        static void Main(string[] args)
        {
            string mystring = "5,6,4,8,5,6,2,5,4,5,4,5,5,8,9,1,10";
            //string mystring = "josaf,mani,josaf,aaryav";
            List<string> uniqueValues = mystring.ToLower().Split(',').Distinct().ToList();
            string UniqueString = string.Join(",", uniqueValues);
            Console.WriteLine(UniqueString);
            Console.ReadLine();
        }

    }
}