Change Number To Words In C#

Introduction

Recently in my current project, I encountered the requirement to generate a customer invoice with the total amount converted into its verbal representation;

Example. 200is "Two Hundred"

5150.20 is "Five thousand one hundred fifty rupees and twenty paise.

Before I wrote my own code, I first googled it, but unfortunately (or maybe I am a bad Googler), I didn't get any solution that could convert numbers into words (Indian Format), so I decided to write my own solution rather than wasting time on Google, I had a basic idea of how to do it, and after doing a lot of code-reengineering, I finally ended up with working code.

Example

using System;
namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Do You wish to continue Y/N");
            while (Console.ReadLine().ToLower() != "n")
            {
                Console.WriteLine("Enter Number");
                string s = Console.ReadLine();
                ConvertMyword(int.Parse(s));
                Console.WriteLine("Do You wish to continue Y/N");
            }
        }
        static void ConvertMyword(int number)
        {
            int flag = 0;
            int lflag = 0;
            string words = String.Empty;
            string[] places = { "ones", "ten", "hundred", "thousand", "ten thousand", "lacs", "tenlacs", "crore", "tencrore", "Billon" };
            string rawnumber = number.ToString();
            char[] a = rawnumber.ToCharArray();
            Array.Reverse(a);
            if (a.Length >= 2)
            {
                for (int i = a.Length - 1; i >= 0; i--)
                {
                    if (i % 2 == 0 && i > 2)
                    {
                        if (int.Parse(a[i].ToString()) > 1)
                        {
                            if (int.Parse(a[i - 1].ToString()) == 0)
                            {
                                words = words + getNumberStringty(int.Parse(a[i].ToString())) + " " + places[i - 1] + " ";
                            }
                            else
                            {
                                words = words + getNumberStringty(int.Parse(a[i].ToString())) + " ";
                            }
                        }
                        else if (int.Parse(a[i].ToString()) == 1)
                        {
                            if (int.Parse(a[i - 1].ToString()) == 0)
                            {
                                words = words + "Ten" + " ";
                            }
                            else
                            {
                                words = words + getNumberStringteen(int.Parse(a[i - 1].ToString())) + " ";
                            }
                            flag = 1;
                        }
                    }
                    else
                    {
                        if (i == 1 || i == 0)
                        {
                            if (int.Parse(a[i].ToString()) > 1)
                            {
                                words = words + getNumberStringty(int.Parse(a[i].ToString())) + " " + getNumberString(int.Parse(a[0].ToString())) + " ";
                                break;
                            }
                            else if (int.Parse(a[i].ToString()) == 1)
                            {
                                if (int.Parse(a[i - 1].ToString()) == 0)
                                {
                                    words = words + "Ten" + " ";
                                }
                                else
                                {
                                    words = words + getNumberStringteen(int.Parse(a[i - 1].ToString())) + " ";
                                }
                                break;
                            }
                            else if (int.Parse(a[i - 1].ToString()) != 0)
                            {
                                words = words + getNumberString(int.Parse(a[i - 1].ToString())) + " ";
                                break;
                            }
                            else
                            {
                                break;
                            }
                        }
                        else
                        {
                            if (flag == 0)
                            {
                                for (int l = i; l >= 0; l--)
                                {
                                    if (int.Parse(a[l].ToString()) != 0)
                                    {
                                        lflag = 1;
                                    }
                                }
                                if (lflag == 1 && int.Parse(a[i].ToString()) != 0)
                                {
                                    words = words + getNumberString(int.Parse(a[i].ToString())) + " " + places[i] + " ";
                                    lflag = 0;
                                }
                                else if (lflag == 0)
                                {
                                    lflag = 0;
                                    break;
                                }
                            }
                            else
                            {
                                words = words + " " + places[i] + " ";
                                flag = 0;
                            }
                        }
                    }
                }
            }
            else
            {
                words = getNumberString(int.Parse(a[0].ToString()));
            }
            Console.WriteLine(words);
        }

        static string getNumberString(int num)
        {
            string Word = String.Empty;
            switch (num)
            {
                case 1:
                    Word = "one";
                    break;
                case 2:
                    Word = "two";
                    break;
                case 3:
                    Word = "three";
                    break;
                case 4:
                    Word = "four";
                    break;
                case 5:
                    Word = "five";
                    break;
                case 6:
                    Word = "six";
                    break;
                case 7:
                    Word = "seven";
                    break;
                case 8:
                    Word = "eight";
                    break;
                case 9:
                    Word = "nine";
                    break;
            }
            return Word;
        }
        static string getNumberStringty(int num)
        {
            string Word = String.Empty;
            switch (num)
            {
                case 2:
                    Word = "twenty";
                    break;
                case 3:
                    Word = "thirty";
                    break;
                case 4:
                    Word = "forty";
                    break;
                case 5:
                    Word = "fifty";
                    break;
                case 6:
                    Word = "sixty";
                    break;
                case 7:
                    Word = "seventy";
                    break;
                case 8:
                    Word = "eighty";
                    break;
                case 9:
                    Word = "ninety";
                    break;
            }
            return Word;
        }
        static string getNumberStringteen(int num)
        {
            string Word = String.Empty;
            switch (num)
            {
                case 1:
                    Word = "eleven";
                    break;
                case 2:
                    Word = "twelve";
                    break;
                case 3:
                    Word = "thirteen";
                    break;
                case 4:
                    Word = "fourteen";
                    break;
                case 5:
                    Word = "fifteen";
                    break;
                case 6:
                    Word = "sixteen";
                    break;
                case 7:
                    Word = "seventeen";
                    break;
                case 8:
                    Word = "eighteen";
                    break;
                case 9:
                    Word = "nineteen";
                    break;
            }
            return Word;
        }
    }
}