Random random = new Random();

int result = random.next(1,10);

Console.Write("Pick a number : ");
int guess = Convert.ToInt32(Console.ReadLine());

while(result != guess)
{
  if(result < guess)
  {
    Console.WriteLine("Too high !");
    Console.Write("Pick a number : ");
    guess = Convert.ToInt32(Console.ReadLine());

  }else if(result < guess)
  {
    Console.WriteLine("Too low !");
    Console.Write("Pick a number : ");
    guess = Convert.ToInt32(Console.ReadLine());

  }

}

Console.WriteLine("You Win ! ");