C#小寫轉大寫

#region 小寫轉大寫
    private string GetNumToUpper(decimal Money)
    {        
        string NumList = "";  
        string RmbList = "";
        int NumLen = 0;  
        int NumChar = 0;
        string N1 = "";
        string N2 = "";
        decimal Mnu = 0;
        int I = 0;
        string numStr = "";
        string Change = "";

        Mnu = Money;
        if (Money > 0)
        {
            Money = Convert.ToDecimal(Money.ToString("#.00"));
        }
        else
        {
            Money = Convert.ToDecimal(Money.ToString("#.00")) * -1;
        }

        NumList = "零壹貳三肆伍陸柒捌玖";
        RmbList = "分角元拾佰仟萬拾佰仟億拾佰仟萬";

        if (Money > 9999999999999.99M)
        {
            return   "-------";     //超出範圍的人民幣值,無法顯示!;
        }

        numStr = Convert.ToString(Convert.ToDecimal(Money * 100).ToString("#"));
        NumLen = numStr.Length;

        I = 0;
        while (I <= NumLen -1)
        {
            NumChar = Convert.ToInt32(numStr.Substring(I, 1));
            N1 = NumList.Substring(NumChar, 1);
            N2 = RmbList.Substring(NumLen - I -1, 1);

            if (N1 != "零")
            {
                Change += N1 + N2;
            }
            else
            {
                    if (N2 == "億" || N2 == "萬" || N2 == "元" || N1 == "零")
                    {
                        while (Change.Substring(Change.Length - 1, 1) == "零")
                        {
                             Change = Change.Substring(0, Change.Length - 1);
                        }
                    }
                    if (N2 == "億" || (N2 == "萬" && Change.Substring(Change.Length - 1, 1) != "億") || N2 == "元")
                    {
                            Change   +=   N2;
                    }
                    else
                    {
                        if (Change.Substring(Change.Length - 2, 2).Substring(0, 1) == "零" || Change.Substring(Change.Length - 1, 1) != "億")
                        {
                            Change   +=   N1;
                        }
                    }
            }
            I++;
        }
        if (Change.Length > 1)
        {
                while (Change.Substring(Change.Length - 1, 1) == "零")
                {
                    Change = Change.Substring(0, Change.Length - 1);
                }
                if (Change.Substring(Change.Length - 1, 1) == "元" || Change.Substring(Change.Length - 1, 1) == "角")
                {
                    Change += "整";
                }
        }

        if (Mnu > 0)
        {
            return Change;
        }
        else
        {
            if (Mnu < 0)
            {
                return "負" + Change;
            }
            else
            {
                return "零元整";
            }
        }
    }
    #endregion