C# Validating user input to numbers and positive numbers

There is nothing technically wrong with your code, you are very thorough and the program is well designed, if this was a challenge issued by and evaluated by a human it would likely pass.

But it's not evaluated by a human but by a machine, and that machine expects the code to do exactly what it instructed you to do and nothing more, the task asks that you check to see if a number is negative and print a message if it is, but that is also all that it asks.

It does not ask you to add a loop that continually prompts for new input when the number given is wrong, logically adding such a loop is correct, and if you were making this program for real, most people would indeed add one. But that doesn't change the fact that the challenge never asks you to do it, and therefore it doesn't expect you to do it either.

The solution to this challenge is therefore far simpler than the code you actually wrote, all you needed to to do pass task 3 is to literally just check to see if the number is negative and print the "You must enter a positive number." message which you did, but you also added a loop along with continue and break statements, this crashes your code due to the fact that the treehouse challenge only provides the program with input once, so asking for input multiple times causes problems.

Here is the solution code:

using System;

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

                if (amountsOfYay < 0) 
                {
                    Console.Write("You must enter a positive number.");
                }

                var counter = 0;

                while (amountsOfYay > counter)
                {
                    Console.Write("Yay! \n");
                    counter += 1;
                }
            }
            catch (FormatException)
            {
                Console.Write("You must enter a whole number.");
            }
        }
    }
}