Program.cs

using System;
using System.Collections.Generic;

namespace NumberGuesser
{
	class Program
	{
		static void Main(string[] args)
		{
			// Step 1: Generate random number between two integers
			Random rnd = new Random();
			int secretNumber = rnd.Next(1, 101);

			// Step 2: Take inputs that are guesses at the random number
			List<int> responseHistory = new List<int>();
			while (true)
			{
				Console.WriteLine("What is your number guess?");
				string response = Console.ReadLine();

				// Totally acceptable way to convert string to int
				// int responseNumber = Convert.ToInt32(response);

				//// Fancy way to convert string to integer
				//int responseNumber;
				//bool success = int.TryParse(response, out responseNumber);
				//if (success == false)
				//{
				//	Console.WriteLine("Invalid input!");
				//	continue;
				//}

				int responseNumber = 0;
				try
				{
					responseNumber = Convert.ToInt32(response);
				}
				catch (Exception ex)
				{
					// Do stuff in case it fails
					Console.WriteLine("Invalid input!");
					Console.WriteLine(ex.Message);
					continue;
				}
				finally
				{
					Console.WriteLine("Does this execute?");
				}

				responseHistory.Add(responseNumber);

				if (secretNumber == responseNumber)
				{
					// The user was correct
					Console.WriteLine("You're correct!");
					break;
				}
				else
				{
					// The user was incorrect
					if (responseNumber > secretNumber)
					{
						Console.WriteLine("Too high, try again!");
					}
					else
					{
						Console.WriteLine("Too low, try again!");
					}

					string guessHistory = "Guess history: ";
					foreach (int value in responseHistory)
					{
						guessHistory = guessHistory + value + ", ";
					}
					Console.WriteLine(guessHistory);
				}
			}

		}
	}
}