I did stuff

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Numerics;


namespace CSharpTutA.cs
{

    class Program
    {

        static void Main(string[] args)
        {

            Console.WriteLine("Hello World");

            for (int i = 0; i < args.Length; i++)
            {
                Console.WriteLine("Arg {0} : {1}", i, args[i]);
            }

            string[] myArgs = Environment.GetCommandLineArgs();

            Console.WriteLine(string.Join(", ", myArgs));

            bool canIVote = true;

            Console.WriteLine("Biggest Integer : {0}", int.MaxValue);
            Console.WriteLine("Smallest Integer : {0}", int.MinValue);

            Console.WriteLine("Biggest Long : {0}", long.MaxValue);
            Console.WriteLine("Smallest Long : {0}", long.MinValue);

            decimal decPiVal = 3.1415926535897932384626433832M;
            decimal decBigNum = 3.00000000000000000000000000011M;
            Console.WriteLine("DEC : PI + bigNum = {0}", decPiVal + decBigNum);

            Console.WriteLine("Biggest Decimal : {0}", Decimal.MaxValue);

            Console.WriteLine("Biggest Double : {0}", Double.MaxValue.ToString("#"));

            double dblPiVal = 3.14159265358979;
            double dblBigNum = 3.00000000000002;
            Console.WriteLine("DBL : PI + bigNum = {0}", dblPiVal + dblBigNum);

            Console.WriteLine("Biggest Float : {0}", float.MaxValue.ToString("#"));

            float fltPiVal = 3.141592F;
            float fltBigNum = 3.000002F;
            Console.WriteLine("FLT : PI + bigNum = {0}", fltPiVal + fltBigNum);

            bool boolFromStr = bool.Parse("True");
            int intFromStr = int.Parse("100");
            double dblFromStr = double.Parse("1.234");

            DateTime awesomeDate = new DateTime(1974, 12, 21);
            Console.WriteLine("Day of Week : {0}", awesomeDate.DayOfWeek);

            awesomeDate = awesomeDate.AddDays(4);
            awesomeDate = awesomeDate.AddMonths(1);
            awesomeDate = awesomeDate.AddYears(1);
            Console.WriteLine("New Date : {0}", awesomeDate.Date);

            TimeSpan lunchTime = new TimeSpan(12, 30, 0);

            lunchTime = lunchTime.Subtract(new TimeSpan(0, 15, 0));
            lunchTime = lunchTime.Add(new TimeSpan(1, 0, 0));
            Console.WriteLine("New Time : {0}", lunchTime.ToString());

            BigInteger bigNum = BigInteger.Parse("12345123451234512345");
            Console.WriteLine("Big Num * 2 = {0}", bigNum * 2);

            Console.WriteLine("Currency : {0:c}", 23.455);

            Console.WriteLine("Pad with 0s : {0:d4}", 23);

            Console.WriteLine("3 Decimals : {0:f3}", 23.4555);

            Console.WriteLine("Commas : {0:n4}", 2300);

            string randString = "This is a string";

            Console.WriteLine("String Length : {0}", randString.Length);

            Console.WriteLine("String Contains is : {0}",
                randString.Contains("is"));

            Console.WriteLine("Index of is : {0}",
                randString.IndexOf("is"));

            Console.WriteLine("Remove string : {0}",
                randString.Remove(10, 6));

            Console.WriteLine("Insert String : {0}",
                randString.Insert(10, "short "));

            Console.WriteLine("Replace String : {0}",
                randString.Replace("string", "sentence"));

            Console.WriteLine("Compare A to B : {0}",
                String.Compare("A", "B", StringComparison.OrdinalIgnoreCase));


            Console.WriteLine("A = a : {0}",
                String.Equals("A", "a", StringComparison.OrdinalIgnoreCase));

            Console.WriteLine("Pad Left : {0}",
                randString.PadLeft(20, '.'));

            Console.WriteLine("Pad Right : {0} Stuff",
                randString.PadRight(20, '.'));

            Console.WriteLine("Trim : {0}",
                randString.Trim());

            Console.WriteLine("Uppercase : {0}",
                randString.ToUpper());

            Console.WriteLine("Lowercase : {0}",
                randString.ToLower());

            string newString = String.Format("{0} saw a {1} {2} in the {3}",
                "Paul", "rabbit", "eating", "field");

            Console.Write(newString + "\n");

            Console.Write(@"Exactly What I Typed");

            Console.ReadLine();

        }

        private static void SayHello()
        {

            string name = "";

            Console.Write("What is your name : ");

            name = Console.ReadLine();

            Console.WriteLine("Hello {0}", name);
        }

    }
}