Personnel accounting using Dictionary

Advanced Personnel accounting

using System.ComponentModel.Design;

namespace iJuniorRefactoring
{
    internal class Program
    {
        public static void Main()
        {
            const string CommandAdd = "1";
            const string CommandShowEmployees = "2";
            const string CommandRemove = "3";
            const string CommandExit = "4";

            bool isOpen = true;
            string enteredText;
            string menuText = $"Press\n" +
                $"{CommandAdd} - to add an employee\n" +
                $"{CommandShowEmployees} - to get a list of employees\n" +
                $"{CommandRemove} - to remove an employee from base\n" +
                $"{CommandExit} - to leave an application";

            Dictionary<string, string> employees = new Dictionary<string, string>();

            while (isOpen)
            {
                Console.WriteLine(menuText);
                Console.SetCursorPosition(0, 7);
                enteredText = Console.ReadLine();

                switch (enteredText)
                {
                    case CommandAdd:
                        AddEmployee(employees);
                        break;

                    case CommandShowEmployees:
                        ShowEmployeesList(employees);
                        break;

                    case CommandRemove:
                        DeleteEmployee(employees);
                        break;

                    case CommandExit:
                        isOpen = ExitApplication();
                        break;

                    default:
                        Console.WriteLine("Incorrect command");
                        break;
                }

                Console.WriteLine("\n\nPress any key to continue...");
                Console.ReadKey();
                Console.Clear();
            }
        }

        static void AddEmployee(Dictionary<string, string> dictionary)
        {
            string name;
            string position;

            Console.WriteLine("Enter name:");
            name = Console.ReadLine();

            Console.WriteLine("Enter position:");
            position = Console.ReadLine();

            if (dictionary.ContainsKey(name) == false)
                dictionary.Add(name, position);
            else
                Console.WriteLine("That person is already in the base!");
        }

        static void ShowEmployeesList(Dictionary<string, string> dictionary)
        {
            if (dictionary.Any())
            {
                foreach (string key in dictionary.Keys)
                    Console.Write($"{key} - {dictionary[key]}; ");
            }
            else
            {
                Console.WriteLine("List is empty!");
            }
        }

        static void DeleteEmployee(Dictionary<string, string> dictionary)
        {
            if (dictionary.Count != 0)
            {
                Console.Write("Enter employees name that needs to be removed: ");
                dictionary.Remove(Console.ReadLine());
            }
            else
            {
                Console.WriteLine("Base is empty!");
            }
        }

        static bool ExitApplication()
        {
            Console.WriteLine("Good bye!");
            return false;
        }
    }
}