static void Main(string[] args) { int number; Factorial obj = new Factorial(); // object of class Factorial System.Console.WriteLine("FACTORIAL CALCULATION\n"); try { System.Console.Write("Enter the number: "); number = Convert.ToInt32(System.Console.ReadLine()); System.Console.WriteLine("Factorial of {0} is: {1}", number, obj.CalculateFactorial(number)); } catch (FormatException e) { System.Console.WriteLine("You can enter numeric values only. Exiting..."); } System.Console.ReadLine(); }