static void Main(String[] args)
            {
    int Option;
    DisplayMenu();
    Option = GetUserOption();
    while (Option != 0)
    {
    switch (Option)
    {
    case 1:
    Num1();
    break;
    case 2:
    Num2();
    break;
    case 3:
    Overall();
    break;
    }
            }
    }
            static void DisplayMenu()
{
Console.WriteLine("1. Num1 2.Num2 3.Overall");
}
static int GetUserOption()
{
int Option;
Console.WriteLine("Pick choice");
Option = Convert.ToInt32(Console.ReadLine());
return Option;
}
               static int Num1()
            {
            int Num1;
            Console.WriteLine("Enter your first number");
            Num1 = Convert.ToInt32(Console.ReadLine());
return Num1;
            }

            static int Num2()
            {
            int Num2;
            Console.WriteLine("Enter your second number");
            Num2 = Convert.ToInt32(Console.ReadLine());
return Num2;
            }

            static int Overall(int Num1, int Num2)
            {
            int Overall;
            Console.WriteLine("This will add the two together");
            Overall = Overall + iNum1 + iNum2;
            Console.WriteLine(Overall);
return Overall;
        }