static void Main(string[] args) { Num2Word numberToword = new Num2Word(); Console.Write("NUMBERS SPEAK Console Appliccation." + "\n\n"); Console.Write("Enter the Number to Convert.." + "\n"); string line; int ln1, value; do { Console.Write(" "); line = Console.ReadLine(); if (line == null) { Console.WriteLine("Please enter a Number"); } else { if (int.TryParse(line, out value)) { ln1 = int.Parse(line); if (ln1 < 0 || ln1 > 4500) { Console.WriteLine("Please enter a number between 0 and 4500"); } else { Console.WriteLine(" " + numberToword.NumberToWords(ln1)); } } else { Console.WriteLine("Please only integer Numbers are allowed.."); } } }while (line != null); }