am Trying To Make A Hungman Game And I Want To Make That The Program Will Say "Congrats Your Have Guessed The Word" If The Word Is Visable?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace hänga_gubbe
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "saviosa";
            char x;
            int counter = 0;
            string ut = "";
            char[] bokstav = new char[7];
            for (int i = 0; i < s.Length; i++)
            {
                bokstav[i] = 'X';
            }
            do
            {
                ut = "";
                Console.Write("mata in en bokstav: ");
                x = Convert.ToChar(Console.ReadLine());
                for (int i = 0; i < s.Length; i++)
                {
                    if (s[i] == x)
                        bokstav[i] = x;
                }
                counter++;
                for (int i = 0; i < s.Length; i++)
                {
                    ut = ut + Convert.ToString(bokstav[i]);

                }
                Console.WriteLine(ut);


            } while (counter < s.Length);






            Console.ReadKey();
        }
    }
}