ATM MACHINE C#

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

namespace ATM_Machine
{
    public class InputUtilities
    {
        public static string GetInput(string inputType)
        {
            string strInput = String.Empty;
            Console.Write("Enter your " + inputType + ": ");
            strInput = Console.ReadLine();

            return strInput;
        }
        public static string getStringInputValue(string inputType)
        {
            string value = String.Empty;
            bool valid = false;
            string inputString = String.Empty;
            do
            {
                inputString = GetInput(inputType);
                if (!String.IsNullOrEmpty(inputString))
                {
                    value = inputString;
                    valid = true;
                }
                else
                {
                    value = "Invalid input";
                    valid = false;
                }
                if (!valid)
                    Console.WriteLine("Invalid " + inputType + " try again!");
            } while (!valid);

            return value;
        }
        public static int getIntegerInputValue(string inputType)
        {
            bool valid = false;
            int value = 0;
            string inputString = String.Empty;
            do
            {
                inputString = GetInput(inputType);
                if (!(String.IsNullOrEmpty(inputString)))
                {
                    valid = Int32.TryParse(inputString, out value);
                }
                if (!valid)
                    Console.WriteLine("Invalid " + inputType + " try again!");
            } while (!valid);

            return value;
        }
        public static double getDoubleInputValue(string inputType)
        {
            bool valid = false;
            double value = 0;
            string inputString = String.Empty;
            do
            {
                inputString = GetInput(inputType);
                if (!(String.IsNullOrEmpty(inputString)))
                {
                    valid = Double.TryParse(inputString, out value);
                }
                if (!valid)
                    Console.WriteLine("Invalid " + inputType + " try again!");
            } while (!valid);

            return value;
        }
        public static char getCharInputValue(string inputType)
        {
            bool valid = false;
            char value = 'u';
            string inputString = String.Empty;
            do
            {
                inputString = GetInput(inputType);
                if (!(String.IsNullOrEmpty(inputString)))
                {
                    valid = Char.TryParse(inputString, out value);
                }
                if (!valid)
                    Console.WriteLine("Invalid " + inputType + " try again!");
            } while (!valid);

            return value;
        }

    }
}




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

namespace ATM_Machine
{
    class Program
    {
        public static double balance = 0;
        public static void Main(string[] args)
        {
            Console.WriteLine("*****Welcome to Junkie's ATM Machine*****");
            Console.WriteLine("*****Press any key to get started*****");
            Console.ReadLine();
            makeSelection();
            getPin();
            userSelection();
        }

        public static void makeSelection()
        {
            Console.WriteLine("Press 1 to login. Press 2 to create new account");
            int choice = InputUtilities.getIntegerInputValue("choice");
            if (choice == 1)
                getUserName();
            if (choice == 2)
                createAccount();

        }

        public static void createAccount()
    {

        Console.WriteLine("What is your desired username");
        string selectedUserName = InputUtilities.getStringInputValue("desired username");
        Console.WriteLine("Username set. Press any key to continue");
        Console.ReadLine();
        Console.WriteLine("What is your desired pin number");
        int selectedPin = InputUtilities.getIntegerInputValue("desired pin");
        Console.WriteLine("Pin set. Press any key to login");
        Console.ReadLine();
        string username;
        Console.WriteLine("*****IDENITIFY YOURSELF*****");
        Console.WriteLine("What is your username?");
        username = InputUtilities.getStringInputValue("username");
        if (username != selectedUserName)
            do
            {
                Console.WriteLine("Invalid Username");
                username = InputUtilities.getStringInputValue("username");
            } while (username != selectedUserName);
        else
        {
            Console.WriteLine("What is your pin?");
        }
        int pin = InputUtilities.getIntegerInputValue("pin");
        if (pin != selectedPin)
            do
            {
                Console.WriteLine("Invalid Pin");
                pin = InputUtilities.getIntegerInputValue("username");
            } while (pin != selectedPin);
        else
        {
            Console.WriteLine("Welcome " + username);
            userSelection();
        }
    }



        public static void getUserName()
        {
            string username;
            Console.WriteLine("*****IDENITIFY YOURSELF*****");
            Console.WriteLine("What is your username?");
            username = InputUtilities.getStringInputValue("username");
            if (username != "junkie")
                invalidUsername();
        }

        public static void invalidUsername()
        {
            string username;
            do
            {
                Console.WriteLine("Invalid Username");
                username = InputUtilities.getStringInputValue("username");
            } while (username != "junkie");
        }

        public static void getPin()
        {
            int pin;
            Console.WriteLine("*****ENTER YOUR PIN*****");
            Console.WriteLine("What is your pin number?");
            pin = InputUtilities.getIntegerInputValue("pin");
            if (pin != 5432)
                invalidPin();
        }

        public static void invalidPin()
        {
            int pin;
            do
            {
                Console.WriteLine("Invalid Pin Number");
                pin = InputUtilities.getIntegerInputValue("pin");
            } while (pin != 5432);
        }

        public static void userSelection()
        {
            Console.WriteLine("*****Welcome to the ATM Machine Menu*****");
            Console.WriteLine("What would you like to do?");
            Console.WriteLine("To Check Balance Press [1]. To input money Press [2]. To withdraw Press [3]. To exit Press [4]. ");
            int selection = InputUtilities.getIntegerInputValue("selection");
            if (selection == 1)
                checkBalance();
            if (selection == 2)
                inputMoney();
            if (selection == 3)
                withdraw();
            if (selection == 4)
                terminate();
        }

        public static void checkBalance()
        {
            Console.WriteLine("*****YOUR BALANCE*****");
            Console.WriteLine("Your balance is " + balance);
            Console.ReadLine();
            userSelection();
        }

        public static void inputMoney()
        {
            Console.WriteLine("*****Input Money*****");
            Console.WriteLine("How much would you like to input?");
            double inputAmount = InputUtilities.getIntegerInputValue("amount");
            balance = balance + inputAmount;
            Console.WriteLine("Your new balance is " + balance + " ***Press ENTER to return to the menu***");
            Console.ReadLine();
            userSelection();
        }
        public static void withdraw()
        {
            Console.WriteLine("*****Withdraw From Your Account*****");
            Console.WriteLine("How much would you like to withdraw?");
            double withdrawAmount = InputUtilities.getDoubleInputValue("amount to take");
            if (withdrawAmount > balance)
                Console.WriteLine("You don't have enough for that");
            else if (withdrawAmount <= balance)
                balance = balance - withdrawAmount;
            Console.WriteLine("Your new balance is " + balance + " ***Press ENTER to return to the menu***");
            Console.ReadLine();
            userSelection();
        }

        public static void terminate()
        {
            Console.WriteLine("Thank you. Press any key to terminate the program...");
            Console.ReadLine();

        }
    }
}