C# Basics: Why won't my code pass the final challenge?

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            var printCount = 0;

            while(true)
            {
                Console.Write("Enter the number of times to print \"Yay!\": ");
                var entry = Console.ReadLine();

                try
                {
                    //Check if the entry is an integer.
                    var totalPrints = int.Parse(entry);

                    if(totalPrints > 0)
                    {
                        //If the entry is a valid integer, print out "Yay" the specified number of times.
                        while(printCount < totalPrints)
                        {
                            Console.WriteLine("Yay!");
                            printCount += 1;
                        }
                    }
                    else
                    {
                        Console.WriteLine("You must enter a positive number.");
                        continue;
                    } 
                }
                catch(FormatException)
                {
                    //If the entry is not an integer, warn the user and return to the prompt.
                    Console.WriteLine("You must enter a whole number.");
                    continue;
                }
                catch(ArgumentNullException)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;
                }
                break;      
            }   
        }
    }
}