数字金额转换成中文金额（C#实现）

public static string ConvertNumAmtToChinese(decimal numVal)
{
decimal org = EMSMath.Round(numVal,2);
string orgData = org.ToString();
int length = orgData.Length;
int j = 0;
string ret = string.Empty;
string temp = string.Empty;
//9,123,456,789,123.12
for (int i=length-1;i>=0;i--)
{
temp = "";
j++;
switch (orgData[i])
{
case '.' : temp = "元";
break;
case '0' : temp = "零";
break;
case '1' : temp = "壹";
break;
case '2' : temp = "贰";
break;
case '3' : temp = "叁";
break;
case '4' : temp = "肆";
break;
case '5' : temp = "伍";
break;
case '6' : temp = "陆";
break;
case '7' : temp = "柒";
break;
case '8' : temp = "捌";
break;
case '9' : temp = "玖";
break;
default : break;
}
switch(j)
{
case 1 : temp = temp + "分";
break;
case 2 : temp = temp + "角";
break;
case 3 : temp = temp + "";
break;
case 4 : temp = temp + "";
break;
case 5 : temp = temp + "拾";
break;
case 6 : temp = temp + "佰";
break;
case 7 : temp = temp + "仟";
break;
case 8 : temp = temp + "万";
break;
case 9 : temp = temp + "拾";
break;
case 10 : temp = temp + "佰";
break;
case 11 : temp = temp + "仟";
break;
case 12 : temp = temp + "亿";
break;
case 13 : temp = temp + "拾";
break;
case 14 : temp = temp + "佰";
break;
case 15 : temp = temp + "仟";
break;
case 16 : temp = temp + "万";
break;
default: break;
}
ret = temp + ret;
}

ret = ret.Replace("零拾","零");
ret = ret.Replace("零佰","零");
ret = ret.Replace("零仟","零");
ret = ret.Replace("零零零","零");
ret = ret.Replace("零零","零");
ret = ret.Replace("零角零分","整");
ret = ret.Replace("零分","整");
ret = ret.Replace("零分","整");
ret = ret.Replace("零亿零万零元","亿元");
ret = ret.Replace("亿零万零元","亿元");
ret = ret.Replace("零亿零万","亿");
ret = ret.Replace("零万零元","万元");
ret = ret.Replace("万零元","万元");
ret = ret.Replace("零亿","亿");
ret = ret.Replace("零万","万");
ret = ret.Replace("零元","元");
ret = ret.Replace("零零","零");
return ret;
}