OrderGivenNumbersByOccuranceDemoUpgrade

namespace NumberInputAndSorting
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    class Program
    {
        const int bottomBorder = 1;
        const int topBorder = 20;
        static void Main(string[] args)
        {
            Dictionary<int, uint> numbers = new Dictionary<int, uint>();
            int input = 0;
            string command = string.Empty;
            bool inputIsValid = false;

            while (true)
            {
                inputIsValid = GetValidInteger(bottomBorder, topBorder, out input, out command);
                if (!inputIsValid)
                {
                    switch (command)
                    {
                        case "stop":
                            {
                                var result = numbers.OrderByDescending(x => x.Value);

                                foreach (var number in result)
                                {
                                    Console.WriteLine("{0} -> {1}", number.Key, number.Value);
                                }

                                return;
                            }
                            break;
                        default:
                            {
                                return;
                            }
                    }
                }
                else
                {
                    if (numbers.ContainsKey(input))
                    {
                        numbers[input]++;
                    }
                    else
                    {
                        numbers.Add(input, 1);
                    }
                }
            }
        }

        static bool GetValidInteger(int bottomBorder, int topBorder, out int number, out string command)
        {
            int inputNumber = 0;
            bool isInBorders = false;
            number = 0;
            command = string.Empty;
            do
            {
                string userInput = string.Empty;
                bool isValidInteger = false;
                Console.Write("Please input integer in diapason {0} - {1}, 'stop' to calculate results or 'exit' to close program: ");
                userInput = Console.ReadLine();
                if (userInput == "stop" || userInput == "exit")
                {
                    command = userInput;
                    return false;
                }
                else
                {
                    isValidInteger = int.TryParse(userInput, out inputNumber);
                    isInBorders = isValidInteger && (inputNumber >= bottomBorder && inputNumber <= topBorder);
                }


            } while (!isInBorders);

            number = inputNumber;
            return true;
        }
    }
}