How to update a value

Question

So, i'm building a bank simulator that includes everything i learned so far, i just wanna take that piece of code to another level, until its power get to over 9000. (Props for DBZ reference!) I'm looking for a way in my piece of code, to update the value of the balance after operation. Because right now, after an operation, my value is resetted and I don't want that. And also, by the same occasion, give me some pointers, tips to make the code shorter, more readable, to add more depth to it!

---

using System;

namespace Bank
{
public class Program
{
    static void Main()
    {
        Console.ForegroundColor = ConsoleColor.Yellow;
        double balance = 2000;
        bool exit = true;
        Console.WriteLine("|----------Welcome to the Nobody's Poor Bank!----------|");
        Console.ReadLine();
        Console.WriteLine("You actually have 2000$ in your bank account.");
        Console.ReadLine();
        Console.Clear();

        while (exit==true)
        {
            Console.WriteLine("What operation would you like to do?\n");
            Console.Write("(W) Withdraw  (D) Deposit  (E) Exit : ");
            string choice = Console.ReadLine();

            switch (choice)
            {
                case "W":
                case "w":
                    Console.Write("\nHow much money would you like to withdraw? : ");
                    string WithdrawAmount = Console.ReadLine();
                    double WithdrawValue;
                    double.TryParse(WithdrawAmount, out WithdrawValue);
                    balance -= WithdrawValue;
                    Console.WriteLine("\nAfter the operation, your balance is now " + balance + "$");
                    Console.ReadKey();
                    Console.Clear();
                    break;

                case "D":
                case "d":
                    Console.Write("\nHow much money would you like to deposit? : ");
                    string DepositAmount = Console.ReadLine();
                    double DepositValue;
                    double.TryParse(DepositAmount, out DepositValue);
                    balance += DepositValue;
                    Console.WriteLine("\nAfter the operation, your balance is now " + balance + "$");
                    Console.ReadKey();
                    Console.Clear();
                    break;

                case "E":
                case "e":
                    Console.WriteLine("\nThank you for using our services!");
                    Console.ReadKey();
                    exit = false;
                    break;

                default:
                    Console.WriteLine("\nThat is not a valid input...");
                    Console.ReadKey();
                    Console.Clear();
                    break;                                                             
            }
        }                
    } 
}
}

Answer 1

1) Declare your balance as static on the program class not on the main thread Like

Static double balance = 2000;

This will update the balance value for the lifetime of the session of the programm run

2) instead of using d and D for your switch cases you can use

Switch(choice.ToUpper())
 Case : "D"

This will convert the choice to Uppercase so you will only test capital letter D or B or whatever. This means that if the user enters d or D it will still give the same output.

3) Using a switch statement means that you want the application to act in a certain way if ancondition is true.....so you dont need to have console, readkey on all the case because only one will be exectuted at a time

Rather put that code after the switch and display after that like this,

Switch(Choice.ToUpper())
{ case : "D"
//some code..........
break;

case : "F"
//some code..........
break;
}
Console.WriteLine(balance.ToString());
Console.ReadKey();

Answer 2

In your code below, you are just calculating what the balance result should be, instead of actually updating it.

Console.WriteLine(
    "\nAfter the operation, your balance is now " + 
    (balance - WithdrawValue) + "$");

Try changing this to

balance -= WithdrawValue;
Console.WriteLine("\nAfter the operation, your balance is now " + balance + "$");

The first line updates the balance variable with the expected result. The second line now just outputs the new value of balance to the Console.