Функции-3

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

namespace Homework3
{
    class Program
    {
        static void Main(string[] args)
        {
            string userInput;
            bool isNumber = false;

            while (isNumber == false)
            {
                isNumber = AskNumber(out userInput, isNumber);
            }
        }

        static bool AskNumber(out string userInput, bool isNumber)
        {
            int result;

            Console.Write("Введите число:");
            userInput = Console.ReadLine();

            isNumber = int.TryParse(userInput, out result);

            if (isNumber == false)
            {
                Console.WriteLine("Вы ввели строку!");
            }
            else
            {
                Console.WriteLine("Вы ввели число!");
                isNumber = true;
            }

            return isNumber;
        }
    }
}