Console.WriteLine ("For the Numbers " + (firstNo) + "," + (secondNo) + "," + (thirdNo));
Console.WriteLine("Largest is ") ;
Console.WriteLine("Smallest is ");

var max = Math.Max(Math.Max(firstNo, secondNo), thirdNo));

var list = new[] {firstNo, secondNo, thirdNo };
var max = list.Max();
var min = list.Min();

List<int> numbers = new List<int>();
    numbers.Add(1);
    numbers.Add(5);
    numbers.Add(7);
    numbers.Add(13);
    numbers.Add(4);
    // And so on
    Console.Write("Numbers in increasing order: ");
    foreach (int number in numbers.OrderBy(x => x))
    {
        Console.Write(number + " ");
    }
    Console.WriteLine();