Converting Amount in Indian Rupess Format

#region AmountInWords
public string AmountInWords(decimal Num) {
    string returnValue;
    //I have created this function for converting amount in indian rupees (INR).
    //You can manipulate as you wish like decimal setting, Doller (any currency) Prefix.


    string strNum;
    string strNumDec;
    string StrWord;
    strNum = Num.ToString();


    if (strNum.IndexOf(".") + 1 != 0) {
        strNumDec = strNum.Substring(strNum.IndexOf(".") + 2 - 1);


        if (strNumDec.Length == 1) {
            strNumDec = strNumDec + "0";
        }
        if (strNumDec.Length > 2) {
            strNumDec = strNumDec.Substring(0, 2);
        }


        strNum = strNum.Substring(0, strNum.IndexOf(".") + 0);
        StrWord = ((double.Parse(strNum) == 1) ? " Rupee " : " Rupees ") + NumToWord((decimal)(double.Parse(strNum))) + ((double.Parse(strNumDec) > 0) ? (" and Paise" + cWord3((decimal)(double.Parse(strNumDec)))) : "");
    } else {
        StrWord = ((double.Parse(strNum) == 1) ? " Rupee " : " Rupees ") + NumToWord((decimal)(double.Parse(strNum)));
    }
    returnValue = StrWord + " Only";
    return returnValue;
}
static public string NumToWord(decimal Num) {
    string returnValue;


    //I divided this function in two part.
    //1. Three or less digit number.
    //2. more than three digit number.
    string strNum;
    string StrWord;
    strNum = Num.ToString();


    if (strNum.Length <= 3) {
        StrWord = cWord3((decimal)(double.Parse(strNum)));
    } else {
        StrWord = cWordG3((decimal)(double.Parse(strNum.Substring(0, strNum.Length - 3)))) + " " + cWord3((decimal)(double.Parse(strNum.Substring(strNum.Length - 2 - 1))));
    }
    returnValue = StrWord;
    return returnValue;
}
static public string cWordG3(decimal Num) {
    string returnValue;
    //2. more than three digit number.
    string strNum = "";
    string StrWord = "";
    string readNum = "";
    strNum = Num.ToString();
    if (strNum.Length % 2 != 0) {
        readNum = System.Convert.ToString(double.Parse(strNum.Substring(0, 1)));
        if (readNum != "0") {
            StrWord = retWord(decimal.Parse(readNum));
            readNum = System.Convert.ToString(double.Parse("1" + strReplicate("0", strNum.Length - 1) + "000"));
            StrWord = StrWord + " " + retWord(decimal.Parse(readNum));
        }
        strNum = strNum.Substring(1);
    }
    while (!System.Convert.ToBoolean(strNum.Length == 0)) {
        readNum = System.Convert.ToString(double.Parse(strNum.Substring(0, 2)));
        if (readNum != "0") {
            StrWord = StrWord + " " + cWord3(decimal.Parse(readNum));
            readNum = System.Convert.ToString(double.Parse("1" + strReplicate("0", strNum.Length - 2) + "000"));
            StrWord = StrWord + " " + retWord(decimal.Parse(readNum));
        }
        strNum = strNum.Substring(2);
    }
    returnValue = StrWord;
    return returnValue;
}
static public string cWord3(decimal Num) {
    string returnValue;
    //1. Three or less digit number.
    string strNum = "";
    string StrWord = "";
    string readNum = "";
    if (Num < 0) {
        Num = Num * -1;
    }
    strNum = Num.ToString();


    if (strNum.Length == 3) {
        readNum = System.Convert.ToString(double.Parse(strNum.Substring(0, 1)));
        StrWord = retWord(decimal.Parse(readNum)) + " Hundred";
        strNum = strNum.Substring(1, strNum.Length - 1);
    }


    if (strNum.Length <= 2) {
        if (double.Parse(strNum) >= 0 && double.Parse(strNum) <= 20) {
            StrWord = StrWord + " " + retWord((decimal)(double.Parse(strNum)));
        } else {
            StrWord = StrWord + " " + retWord((decimal)(System.Convert.ToDouble(strNum.Substring(0, 1) + "0"))) + " " + retWord((decimal)(double.Parse(strNum.Substring(1, 1))));
        }
    }


    strNum = Num.ToString();
    returnValue = StrWord;
    return returnValue;
}
static public string retWord(decimal Num) {
    string returnValue;
    //This two dimensional array store the primary word convertion of number.
    returnValue = "";
    object[, ] ArrWordList = new object[, ] {
        {
            0, ""
        }, {
            1, "One"
        }, {
            2, "Two"
        }, {
            3, "Three"
        }, {
            4, "Four"
        }, {
            5, "Five"
        }, {
            6, "Six"
        }, {
            7, "Seven"
        }, {
            8, "Eight"
        }, {
            9, "Nine"
        }, {
            10, "Ten"
        }, {
            11, "Eleven"
        }, {
            12, "Twelve"
        }, {
            13, "Thirteen"
        }, {
            14, "Fourteen"
        }, {
            15, "Fifteen"
        }, {
            16, "Sixteen"
        }, {
            17, "Seventeen"
        }, {
            18, "Eighteen"
        }, {
            19, "Nineteen"
        }, {
            20, "Twenty"
        }, {
            30, "Thirty"
        }, {
            40, "Forty"
        }, {
            50, "Fifty"
        }, {
            60, "Sixty"
        }, {
            70, "Seventy"
        }, {
            80, "Eighty"
        }, {
            90, "Ninety"
        }, {
            100, "Hundred"
        }, {
            1000, "Thousand"
        }, {
            100000, "Lakh"
        }, {
            10000000, "Crore"
        }, {
            100000000, "Ten Crore"
        }, {
            1000000000, "Arab"
        }, {
            10000000000, "Ten Arab"
        }, {
            100000000000, "Kharab"
        }
    };


    int i;
    for (i = 0; i <= (ArrWordList.Length - 1); i++) {
        if (Num == System.Convert.ToDecimal(ArrWordList[i, 0])) {
            returnValue = (string)(ArrWordList[i, 1]);
            break;
        }
    }
    return returnValue;
}
static public string strReplicate(string str, int intD) {
    string returnValue;
    //This fucntion padded "0" after the number to evaluate hundred, thousand and on....
    //using this function you can replicate any Charactor with given string.
    int i;
    returnValue = "";
    for (i = 1; i <= intD; i++) {
        returnValue = returnValue + str;
    }
    return returnValue;
}#endregion