Go4Expert - Hey guys im new here and need some help with my coding-random guessing game

Code:

using System;

using System.Collections.Generic;

using System.Text;



namespace _._

{

    class Program

    {

        static void Main(string[] args)

        {

            while (true)

            {

                int randomNumber = GenerateNumber(1, 21);

                int counter = 1;

                while (true)

                {

                    Console.Write("Enter a number between 1 and 20(0 to quit):");

                    int input = Convert.ToInt32(Console.ReadLine());



                    if (input == 0)

                        return;

                    else if (input < randomNumber)

                    {

                        Console.WriteLine("Too low, try again.");

                        ++counter;

                        continue;

                    }

                    else if (input > randomNumber)

                    {

                        Console.WriteLine("Too high, try again.");

                        ++counter;

                        continue;

                    }

                    else

                    {

                        Console.WriteLine("You guessed it! The number was {0}!", randomNumber);

                        if (counter == 1)

                            Console.WriteLine("And you guessed it right away! Bonus points!\n");

                        else

                            Console.WriteLine("It took you {0} {1}.\n", counter, counter == 1 ? "try" : "tries");

                        break;

                    }

                }

            }



        }

        static int GenerateNumber(int min, int max)

        {

            Random random = new Random();

            return random.Next(min, max);

        }

    }

}

This code is for a guessing game, the user inputs a number and the computer states if its right or wrong

no I got the basics but I need to do more, I need an option to ask the user how many games he wants, and to only allow the user 6 tries before he or she loses, also I need the numbers in the range to get smaller and smaller after each guess

im so stuck on this, any help would be great
I tried

Code:

if (counter == 6)

                        Console.WriteLine("You have attempted 6 times, you lost");

                    break;

and that didnt work

also tried

Code:

int guess = 0;

     for( guess = 0; guess < 6; guess++ )

     {

           .

           .

           .

           if( input == random )

             break;

     }

     if( guess < 6 )

        Console.WriteLine("It took you {0} {1}.\n", guess+1, (guess + 1) == 1 ? "try" : "tries");

     else

        Console.WriteLine("You lost.");

and that didnt work either