How to Convert Number in Indian Currency format(like lakh and crore format)?

A method to convert any number in indian curreny format in words.

public string NumberToText(int number)
    {

        if (number == 0) return "Zero";

        if (number == -2147483648) return "Minus Two Hundred and Fourteen Crore Seventy Four Lakh Eighty Three Thousand Six Hundred and Forty Eight";

        int[] num = new int[4];
        int first = 0;
        int u, h, t;
        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        if (number < 0)
        {
            sb.Append("Minus ");
            number = -number;
        }

        string[] words0 = {"" ,"One ", "Two ", "Three ", "Four ", 
"Five " ,"Six ", "Seven ", "Eight ", "Nine "};

        string[] words1 = {"Ten ", "Eleven ", "Twelve ", "Thirteen ", "Fourteen ", 
"Fifteen ","Sixteen ","Seventeen ","Eighteen ", "Nineteen "};

        string[] words2 = {"Twenty ", "Thirty ", "Forty ", "Fifty ", "Sixty ", 
"Seventy ","Eighty ", "Ninety "};

        string[] words3 = { "Thousand ", "Lakh ", "Crore " };

        num[0] = number % 1000; // units 
        num[1] = number / 1000;
        num[2] = number / 100000;
        num[1] = num[1] - 100 * num[2]; // thousands 
        num[3] = number / 10000000; // crores 
        num[2] = num[2] - 100 * num[3]; // lakhs 

        for (int i = 3; i > 0; i--)
        {
            if (num[i] != 0)
            {
                first = i;
                break;
            }
        }


        for (int i = first; i >= 0; i--)
        {
            if (num[i] == 0) continue;

            u = num[i] % 10; // ones 
            t = num[i] / 10;
            h = num[i] / 100; // hundreds 
            t = t - 10 * h; // tens 

            if (h > 0) sb.Append(words0[h] + "Hundred ");

            if (u > 0 || t > 0)
            {
                if (h > 0 || i == 0) sb.Append("and ");

                if (t == 0)
                    sb.Append(words0[u]);
                else if (t == 1)
                    sb.Append(words1[u]);
                else
                    sb.Append(words2[t - 2] + words0[u]);
            }

            if (i != 0) sb.Append(words3[i - 1]);

        }
        return sb.ToString().TrimEnd();
    }