Positive or Negative

Below is the complete code for the Positive or Negative Try It Out! problem.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PositiveOrNegative
{
    class Program
    {
        static void Main(string[] args)
        {
            // Ask the user for two numbers, converting them
            // both to ints.
            Console.Write("Enter number 1: ");
            string input = Console.ReadLine();
            int number1 = Convert.ToInt32(input);

            Console.Write("Enter number 2: ");
            input = Console.ReadLine();    // We'll just reuse this variable.
            int number2 = Convert.ToInt32(input);

            if (number1 == 0 || number2 == 0)
            {
                Console.WriteLine("The result won't be positive or negative.");
                Console.WriteLine(
                    "One of the factors is 0, so the product will be 0 as well.");
            }
            else
            {
                // Figure out if each of the numbers, individually, are positive.
                bool number1Positive;
                bool number2Positive;

                if (number1 > 0) { number1Positive = true; }
                else { number1Positive = false; }

                if (number2 > 0) { number2Positive = true; }
                else { number2Positive = false; }

                // If they have the same sign (both positive, or both negative)
                // then print out that the result will be positive.
                if ((number1Positive && number2Positive) ||
                    (!number1Positive && !number2Positive))
                {
                    Console.WriteLine("The product will be positive.");
                }
                else // Otherwise, they have different signs, and be negative.
                {
                    Console.WriteLine("The product will be negative.");
                }
            }

            // Wait for the user to respond before closing...
            Console.ReadKey();
        }
    }
}