Compilation Failed; C# Basics Final

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main ()
        {
            while ()
            {
                Console.Write("Enter the number of times to print \"Yay!\": ");
                var entry = Console.ReadLine();

                try
                {
                    var numTimes = int.Parse(entry);
                    if (numTimes <=1)
                    {
                        Console.WriteLine("You must enter a positive number.");
                    }
                    while (numTimes > 0)
                    {
                        Console.WriteLine("Yay!");
                        numTimes--;
                    }
                }

                catch (FormatException)
                {
                    Console.WriteLine("You must enter a whole number.");
                }
            }
        }
    }
}