Remove dublicates, C#

Remove dublicates

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var str = "dhhgghjkffyihdyjjgefho";
            //Your code goes here
            Console.WriteLine(RemoveDublicates2("Hello, world!"));
        }

public static string RemoveDublicates(string str){
           var result = str.Distinct().ToArray();
            return new string(result);
        }

public static string RemoveDublicates2(string str){
            var resultBuilder = new StringBuilder();
            var set = new HashSet<char>();
           // var arr = str.ToCharArray();
            foreach(char ch in str){
                set.Add(ch);
            };
            return new string(set.ToArray());
        }
    }
}


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