Code Challenge Error bug?

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            bool keepGoing = true;

            while (keepGoing == true)
            {
                //Prompt user for number of 'Yays'
                Console.Write("Enter the number of times to print \"Yay!\": ");
                string entry = Console.ReadLine();

                if (entry.ToLower() == "quit")
                {
                    keepGoing = false;
                }
                else
                {
                    try
                    {
                        var numberYays = int.Parse(entry);

                        if (numberYays <= 0)
                        {
                            Console.WriteLine(numberYays + " is not an acceptable value.");
                            continue;
                        }
                        else if (numberYays > 25)
                        {
                            Console.WriteLine(numberYays + " are too many \"Yay!'s\" for one day.");
                            continue;
                        }
                        else 
                        {
                           Console.WriteLine (String.Concat(Enumberable.Repeat("Yay! ", numberYaysy))); 
                        }
                    catch (FormatException)
                    {
                        Console.WriteLine("That is not valid input.");
                        continue;
                    }



                    }
                    //Repeat until user quits
                }

                Console.WriteLine("Goodbye");
            }


        }
    }
}