More help on the Console Hangman

Question

This is what i would like but not sure on the actual code to go about getting it....

//Draws the game display

function UpdateGameDisplay 

    Write contents of "hangboard" string to the console. 

    Write contents of "wordboard" string to the console.

    Write contents of "guessedletters" string to the console.

end function

//Returns whatever the user enters, checks for errors

string function GetUserInput 

    Get character from console

    Check that string is a single character and is valid (A-Z)

//Compares the user input to the already guessed letters, and updates as necessary

bool function CheckGuessedLetters(userletter) 

    //Check the guessed letters string to see if character has already been used.

    loop each letter in "guessedletters"

        if letter == userletter return true

    end loop

    Add letter to guessed letters string

    return false

This is what i have:

namespace Console_Hangman

{

    class Program

    {

        static void Main(string[] args)

        {

            // Displays the gamestart

            Console.WriteLine("Welcome to Hangman, Let's Play.");

            Console.WriteLine("Please Type Your Secret Word");

            Console.ForegroundColor = ConsoleColor.Black;

            string secretWord = Console.ReadLine();

            string wordBoard = string.Empty;

            Console.ForegroundColor = ConsoleColor.White;

            Console.WriteLine("Your secret Word is");

            Console.Write("");

            for (int length = 0; length < secretWord.Length; length++)

            {

                wordBoard = wordBoard + "_";

            }

            Console.WriteLine(wordBoard);

            Console.WriteLine("");

            Console.WriteLine("Enter a letter");

            Console.ReadLine();

        }

    }

}