Find The Biggest Number

/*
 * Write a program that finds the biggest of three integers using nested if statements.
*/

using System;

class FindTheBiggestNumber
{
    static void Main()
    {
        int number1, number2, number3, biggestNumber;
        string invalidInput = "Please enter a value between " + int.MinValue + " and " + int.MaxValue + Environment.NewLine;
        bool equal;

        do
        {
            Console.WriteLine("Enter three different integer numbers!" + Environment.NewLine);
            Console.WriteLine("Enter value of number1: ");
            while (!(int.TryParse(Console.ReadLine(), out number1) && number1 >= int.MinValue && number1 <= int.MaxValue))
            {
                Console.WriteLine(invalidInput);
                Console.WriteLine("Enter value of number1: ");
            }

            Console.WriteLine("Enter value of number2: ");
            while (!(int.TryParse(Console.ReadLine(), out number2) && (number2 >= int.MinValue) && (number2 <= int.MaxValue)))
            {
                Console.WriteLine(invalidInput);
                Console.WriteLine("Enter value of number2: ");
            }

            Console.WriteLine("Enter value of number3: ");
            while (!(int.TryParse(Console.ReadLine(), out number3) && (number3 >= int.MinValue) && (number3 <= int.MaxValue)))
            {
                Console.WriteLine(invalidInput);
                Console.WriteLine("Enter value of number3: ");
            }
            if(number1 == number2 || number1 == number3 || number2 == number3)
            {
                 equal = true;
            }
            else
            {
                equal = false;
            }
            Console.WriteLine();
        } while(equal);

        bool checkNumber1 = number1 > number2 && number1 > number3;
        bool checkNumber2 = number2 > number1 && number2 > number3;

        if (checkNumber1)
        {
            biggestNumber = number1;
        }
        else if (checkNumber2)
        {
            biggestNumber = number2;
        }
        else
        {
            biggestNumber = number3;
        }
        Console.WriteLine();
        Console.WriteLine("{0} is the biggest number!" + Environment.NewLine, biggestNumber);
        Main();
    }
}