Normally I don't reply to such threads, but you have solved the issue (even with some minor faults) and you're looking for alternative methods... so I'm more than happy to help.  

Based on your prior post:

"Write a program that asks the user to enter a series of non-zero integers, one at a time.
The program should keep asking the user for a number until they enter a value of 0.
The program should then display the largest of the numbers that have been entered.
Be aware that the user could enter all negative integers and your program has to be
able to handle this."

Keep in mind I did this fairly quickly so it's a bit rushed, but I added in comments.

The goal here is to accept input until 0 has been entered. You need to do the following though... verify if the input is actually an integer. Unless I missed it, your code doesn't verify if someone types in "a" or "45.02a" or "1.25". Once the input has been verified you would track the prior input the current input to see which number is higher. Naturally if you enter in all negative numbers then 0, 0 would be the highest.

Code below:

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Variable to track the highest input.
            int highestNumber = 0;

            // Create a holding variable for the input
            string enteredNumber = "";

            // Create a boolean to decide if the program should continue checking, ect...
            bool cycleComplete = false;

            // ==================================================================

            // Loop

            while (cycleComplete == false)
            {
                // Ask for input
                Console.WriteLine("Please enter an interger below: ");

                // Get input
                enteredNumber = Console.ReadLine();

                // Verify Input
                int number = 0;
                if (Int32.TryParse(enteredNumber, out number) == true)
                {
                    // Input is actually an interger - compare and set the new highest
                    if (number > highestNumber)
                    {
                        highestNumber = number;
                    }

                    // Check if the number is 0
                    if (number == 0)
                    {
                        cycleComplete = true;
                    }

                }
                else
                {
                    // Input was not an interger
                    Console.WriteLine("Not an interger! - Try again!");
                }
            }

            // Final
            Console.WriteLine("==========================");
            Console.WriteLine("You have entered 0, and your largest interger was: " + highestNumber);
            Console.WriteLine("==========================");
            Console.WriteLine("Press any key to exit.");

            // End
            Console.Read();
        }
    }
}

I hope this helps understand things better, and if you have questions let me know. Happy coding!