Loops/Task 8 - GCD Second Version

using System;
class GreatestCommonDivisorSecondVersion
{
    static void Main()
    {
        Console.WriteLine("enter two numbers:");
        int firstValue = int.Parse(Console.ReadLine());
        int secondValue = int.Parse(Console.ReadLine());
        bool check = secondValue % firstValue != 0;
        bool checkTwo = firstValue % secondValue != 0;
        if ((secondValue < firstValue) && (firstValue != 0) && (secondValue != 0))
        {
            while ((firstValue != 0) && (secondValue != 0))
            {
                firstValue %= secondValue;
                if ((firstValue == 0) || (secondValue == 0))
                {
                    break;
                }
                secondValue %= firstValue;
            }
            if (firstValue == 0)
            {
                Console.WriteLine("The Greatest Common Divisor of yout numbers is: " + secondValue);
            }
            else if (secondValue == 0)
            {
                Console.WriteLine("The Greatest Common Divisor of yout numbers is: " + firstValue);
            }
        }
        else if ((firstValue < secondValue) && (firstValue != 0) && (secondValue != 0))
        {
            while ((firstValue != 0) && (secondValue != 0))
            {
                secondValue %= firstValue;
                if ((firstValue == 0) || (secondValue == 0))
                {
                    break;
                }
                firstValue %= secondValue;
            }

            if (firstValue == 0)
            {
                Console.WriteLine("The Greatest Common Divisor of yout numbers is: " + secondValue);
            }
            else if (secondValue == 0)
            {
                Console.WriteLine("The Greatest Common Divisor of yout numbers is: " + firstValue);
            }
        }
        else
        {
            Console.WriteLine("Wrong Input!");
        }
    }
}