public static void Main()
Console.WriteLine("Please enter an interger.");
input = Console.ReadLine();
loop = Int32.TryParse(input, out first);
Console.WriteLine("Invalid entry. Must be a whole number.");
Console.WriteLine("Please enter a second interger.");
input = Console.ReadLine();
loop = Int32.TryParse(input, out second);
Console.WriteLine("Invalid entry. Must be a whole number.");
Console.WriteLine("first: " + first);
Console.WriteLine("second: " + second);
for(int i = first; i <= second; i++)
Console.WriteLine(i + " ");