Does not exist in the current context?? I don't understand where I went wrong.

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
      static void Main()
        { 
            try
            {
            Console.Write("Enter the number of times to print \"Yay!\": ");
            string input = Console.ReadLine();
            counter = int.Parse(input);
            }
            catch(FormatException c)
            {
                Console.Write("You must enter a whole number.");
            }

            int i = 0;
            while(i < counter)
            {
                i += 1;   
                Console.WriteLine("Yay!");
            }
        }
    }
}