class OptionalParameters

{

       [STAThread]

       static void Main(string[] args)

       {

              //call optionalStrings with no arguments

              optionalStrings();

              //call with 5 arguments

              optionalStrings("One","Two","Three","Four", "Five");

              //pause here so we can see the output

              Console.ReadLine();

       }

       public static void optionalStrings(params String[] args)

       {     

              //args is an actual array, so we can use any array methods

              Console.WriteLine("Number of arguments: " + args.GetLength(0).ToString());

              for (int i = 1; i<args.GetLength(0)+1; i++)

              {

                     Console.WriteLine("Argument #{0} {1}",i.ToString(),args[i-1]);

              }

       }

}