Eds Simple Calculator in C#

//Launch.cs
using System                    ;
using System.Collections.Generic;
using System.Linq               ;
using System.Text               ;
using System.Threading.Tasks    ;

namespace SimpleCalculator
{
    class Launch
    {
        private static Calculator calc;

        static void Main (string[] args)
        {
            calc = new Calculator();
        }
    }
}


//Calculator.cs
using System                    ;
using System.Collections.Generic;
using System.Linq               ;
using System.Text               ;
using System.Threading.Tasks    ;

namespace SimpleCalculator
{
    class Calculator
    {
        //Variables
        private static double[] userValues = new double[2];

        //Constructor
        public Calculator()
        {
            header();
            flow  ();
        }
        //Methods
        //Program Operation
        private static void header()
        {
            Console.Write("====================================================================================================" + "\n"
                         +"Edward R. Gonzalez"                                                                                   + "\n"
                         +"December 12, 2016"                                                                                    + "\n"
                         +"Lynda Class C# Essentials"                                                                            + "\n"
                         +"                                       Simple Calculator                                            " + "\n"
                         +""                                                                                                     + "\n"
                         +""                                                                                                     + "\n"
                         +"            Press enter to begin."                                                                    + "\n");

            Console.ReadLine();
        }

        private static void flow()
        {
            bool quit = false; while (quit == false)
            {
                for (int counter = 0;
                         counter < 2;
                         counter  ++)
                {
                    getValue(counter);
                }

                printVals      ();
                decideOperation();

                quit = giveResult();
            }
        }

        private static void getValue(int index)
        {
            Console.Write("Please enter a number: ");

            double userInput = double.Parse(Console.ReadLine());

            userValues[index] = userInput;
        }

        private static void printVals()
        {
            Console.WriteLine("\n"
                             +"Your initial values:" + "\n");

            foreach (double value in userValues)
            {
                Console.WriteLine(value);
            }
        }

        public static void decideOperation()
        {
            bool complete = false; while (complete == false)
            {
                Console.Write("\n"
                             +"What operation would you like to complete?"                            + "\n"
                             +"Possible choices: Add, Subtract, Multiply, Divide, or help if needed." + "\n"
                             +": ");

                String userInput = Console.ReadLine();


                if      (userInput.Equals("Add"     , StringComparison.InvariantCultureIgnoreCase))
                {
                    userValues[0] = add     (userValues[0], userValues[1]);
                    complete = true;
                }
                else if (userInput.Equals("Subtract", StringComparison.InvariantCultureIgnoreCase))
                {
                    userValues[0] = subtract(userValues[0], userValues[1]);
                    complete = true;
                }
                else if (userInput.Equals("Multiply", StringComparison.InvariantCultureIgnoreCase))
                {
                    userValues[0] = multiply(userValues[0], userValues[1]);
                    complete = true;
                }
                else if (userInput.Equals("divide"  , StringComparison.InvariantCultureIgnoreCase))
                {
                    userValues[0] = divide  (userValues[0], userValues[1]);
                    complete = true;
                }
                else if (userInput.Equals("help"    , StringComparison.InvariantCultureIgnoreCase))
                {
                    Console.WriteLine("\n"
                                     + "The first two values taken in the program will be put through a mathamatical operation of your choosing from the list aformentioned.");
                }
                else
                {
                    Console.WriteLine("\n"
                                     +"No inputs reconizable to commands known, please enter agian.");
                }
            }
        }

        public static bool giveResult()
        {
            bool quit;
            Console.Write    ("\n"+"Result: ");
            Console.WriteLine(userValues[0]);

            Console.Write("\n" + "If you would like to leave type quit, if not press enter to continue."+ "\n:");
            String userInput = Console.ReadLine();

            if (userInput.Equals("Quit", StringComparison.CurrentCultureIgnoreCase))
            {
                quit = true;
            }
            else
            {
                quit = false;
            }

            return quit;
        }

        //Arithmetic functions
        public static double add     (double valOne, double valTwo)
        {
            double result;

            result = valOne + valTwo;

            return result;
        }

        public static double subtract(double valOne, double valTwo)
        {
            double result;

            result = valOne - valTwo;

            return result;
        }

        public static double multiply(double valOne, double valTwo)
        {
            double result;

            result = valOne * valTwo;

            return result;
        }

        public static double divide  (double valOne, double valTwo)
        {
            double result;

            result = valOne / valTwo;

            return result;
        }
    }
}

//Readme.txt
Simple Calculator

Author: Edward R. Gonzalez
Date  : December 12, 2016

Notes: Created for lynda C# Essentials class on the simple calculator assignment to fully understand the c# language.
       Went a bit over what was specified for the program to accomplish.