public static void Main()
Console.WriteLine("Hi, please press 1 if you want to see the EVEN numbers between 1-100, or 2 if you want to see all the ODD ones ");
num = int.Parse(Console.ReadLine());
for (int i=1; i<=100; i++)
for (int i=1; i<=100; i++)
Console.WriteLine("That option isn´t possible to show, please try with numbers 1 or 2");