public static string ValidateInput(string title, string description)
        {
            while (true)
            {
                Console.WriteLine("Please enter a title:");
                try
                {
                    title = ValidateString(Console.ReadLine().ToString());
                }
                catch (Exception) //ex???
                {
                    Console.WriteLine("Failed to parse title parameter.");
                }
                if (title.Length < 10 || title.Length > 50)
                {
                    Console.WriteLine("Title should be a string between 10 and 50 symbols.");
                    continue;
                }
                else
                {
                    break;
                }
            }
            while (true)
            {
                Console.WriteLine("Please enter a description:");
                try
                {
                    description = ValidateString(Console.ReadLine().ToString());
                }
                catch (Exception) //ex???
                {
                    Console.WriteLine("Failed to parse description parameter.");
                }
                if (description.Length < 10 || description.Length > 500)
                {
                    Console.WriteLine("Description should be a string between 10 and 500 symbols.");
                    continue;
                }
                else
                {
                    break;
                }
            }
            return "";
        }