cannot figure out while random number generator game is not working c#

I am programming a game that generates a random number and then has the user try to guess the number when the user inputs a number the program will respond with either too high or too low depending on the number generated.The problem I am having is that the loop will just keep executing and the program will not take another user input if the number is incorrect.I have tried using different types of loops like a do while and for loop but keep getting the same problem I feel as though I am missing something simple or making a simple mistake thanks

        string usernumber;

        Random rnd = new Random();

        int value = rnd.Next(1,50); //generates a random number upto 50

        int guess = 0;

        Console.WriteLine("please enter a number"); //asks for and takes user input

        usernumber = Console.ReadLine();//stores user input

        guess = Convert.ToInt32(usernumber);

        while (guess != value) //this stands for not equals to 
        {
            //guess = Convert.ToInt32(usernumber);

            if (value > guess)
            {
                Console.WriteLine("too high");
            }
            else if (value < guess)
            {
                Console.WriteLine("too low");
            }
            else if (value == guess)
            {
                Console.WriteLine("bang on the answer was" + value);
            }
            else
            {
                Console.WriteLine("errrrrrrrrr");
            }
        }   



        Thread.Sleep(2000); //delays the program closing for a bit