(C #) uppercase conversion of numeric currency

Capital | currency | Convert I now do the project requirements on the numeric currency, converted to uppercase, search on the internet for a long time, did not find C # written type, had to write their own, testing, but also to meet the requirements, but the algorithm is a bit cumbersome, there is no one to change the shrimp again
Here's My Code:
Using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;

Namespace Winmarket
{
<summary>
Summary description of the Classfun.
</summary>
public class Classfun
{
private string Capstr;

Public Classfun ()
{
//
TODO: Add constructor logic here
//
}
public string Moneynumtocap (decimal Num)
{
String cap= "0 A three Woolu qi Ba Nine";
String numstr= "0123456789";
String moneynumstr=num.tostring ();
int Pint=moneynumstr.indexof (".");
int numint;

String Moneyint=null;
String Moneydec=null;
String Intstr=null;
String Moneycap=null;
String Moneyintstr=null;
String Moneydecstr=null;
Capstr=pint.tostring ();

if (pint!=-1)
{
String strarr= ".";
Char[] Chararr=strarr.tochararray ();
String[] Moneynumarr=moneynumstr.split (Chararr);
Moneyint=moneynumarr[0]. ToString ();
MONEYDEC=MONEYNUMARR[1]. ToString ();

}
Else
{
MONEYINT=MONEYNUMSTR;
moneydec= "00";
}

if (moneyint.length>16)
{
MessageBox.Show ("Numerical hyper-boundary");
}
Else
{
---process an integer part--------

for (int j=1;j<=moneyint.length;j++)
{
Moneyintstr=moneyint.substring (j-1,1);
for (int i=0;i<=9;i++)
{

Intstr=numstr.substring (i,1);
Moneycap=cap.substring (i,1);

if (MONEYINTSTR==INTSTR)
{

Switch (INTSTR)
{
Case "0":
Capstr=capstr+moneycap;
Break
Case "1":
Capstr=capstr+moneycap;
Break
Case "2":
Capstr=capstr+moneycap;
Break
Case "3":
Capstr=capstr+moneycap;
Break
Case "4":
Capstr=capstr+moneycap;
Break
Case "5":
Capstr=capstr+moneycap;
Break
Case "6":
Capstr=capstr+moneycap;
Break
Case "7":
Capstr=capstr+moneycap;
Break
Case "8":
Capstr=capstr+moneycap;
Break
Case "9":
Capstr=capstr+moneycap;
Break
}
}
}
numint=moneyint.length-j+1;
Switch (numint)
{
Case 16:
capstr=capstr+ "thousand million";
Break
Case 15:
capstr=capstr+ "Hundred million";
Break
Case 14:
capstr=capstr+ "Collect million";
Break
Case 13:
Capstr=capstr+ "million";
Break

Case 12:
capstr=capstr+ "thousand";
Break

Case 11:
capstr=capstr+ "Bai";
Break

Case 10:
capstr=capstr+ "Pick up";
Break

Case 9:
Capstr=capstr+ "billion";
Break

Case 8:
capstr=capstr+ "thousand";
Break

Case 7:
capstr=capstr+ "Bai";
Break

Case 6:
capstr=capstr+ "Pick up";
Break


Case 5:
Capstr=capstr+ "million";
Break

Case 4:
capstr=capstr+ "thousand";
Break
Case 3:
capstr=capstr+ "Bai";
Break
Case 2:
capstr=capstr+ "Pick up";
Break
Case 1:
capstr=capstr+ "Yuan";
Break

}

}

------deal with a small number of parts--
for (int j=1; j<=2; j + +)
{
Moneydecstr=moneydec.substring (j-1,1);

for (int i=0;i<=9;i++)
{
Intstr=numstr.substring (i,1);
Moneycap=cap.substring (i,1);
if (MONEYDECSTR==INTSTR)
{

Switch (INTSTR)
{
Case "0":
Capstr=capstr+moneycap;
Break
Case "1":
Capstr=capstr+moneycap;
Break
Case "2":
Capstr=capstr+moneycap;
Break
Case "3":
Capstr=capstr+moneycap;
Break
Case "4":
Capstr=capstr+moneycap;
Break
Case "5":
Capstr=capstr+moneycap;
Break
Case "6":
Capstr=capstr+moneycap;
Break
Case "7":
Capstr=capstr+moneycap;
Break
Case "8":
Capstr=capstr+moneycap;
Break
Case "9":
Capstr=capstr+moneycap;
Break
}
}
}


Switch (j)
{
Case 1:
capstr=capstr+ "angle";
Break
Case 2:
capstr=capstr+ "points";
Break

}

}

}

return capstr;
}








}
}