Tests if integer, if date, has some date manipulation methods. The helper methods in class Tester were developed as part of lessons associated with the following online tutorial series: http://williammillerservices.com/windows-c-console-programming/

tester1.cs

using System;
/* a helper class, Tester, begun in Lesson 5 of intro C# console
programming series found at the following URL:
http://williammillerservices.com/windows-c-console-programming/
note: to use, you would reference the file containing this code
from your primary program file. If you have the following program...
GitHub gist -> https://gist.github.com/kyrathasoft/35357f7fee1c427693323286111e5e43
Pastebin.com -> https://pastebin.com/edit/K6D01kgv

using System;
using TestInput;

namespace MyNS{
	class MyCls{
		public static void Main(){
			string sNum = "4";
			if(Tester.IsInteger(sNum)){
				Console.WriteLine("Yes, we can parse {0} to an int.", sNum);
			}
		}
	}
}

...and if above program named test.cs and below is tester.cs and in
same directory, then we'd compile like so:

csc /out:test.exe test.cs tester.cs

Running resulting test.exe would produce: Yes, we can parse 4 to an int.

Or, we could make tester.cs code into DLL via:
csc /t:library tester.cs

...and then compile like so:
csc /r:tester.dll test.cs

*/


namespace TestInput
{
    public class Tester
    {
        public static bool IsInteger(string p)
        {
            bool result = false;
            int i;

            if (int.TryParse(p, out i))
            {
                result = true;
            }

            return result;
        }

    }

}