Currency Format

Question

Please help me to build my own function for the currency format:

I've made here a function for addPadding, now I need a formatCurrency method.

This is the example:

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(addPadding("2567675432", 18, "R", "*"));
        Console.ReadKey();
    }

    public static String addPadding(String strInputString, int iScale, String strDirection, String strPaddingCharacter)
    {
        String strReturnValue = strInputString;
        if (strInputString.Length < iScale)
        {
            for(int i = 0; i< iScale - strInputString.Length; i++)
            {
                if (strDirection == "R") strReturnValue += strPaddingCharacter;
                if (strDirection == "L") strReturnValue = strPaddingCharacter + strReturnValue;
                if (strReturnValue.Length == iScale) break;
            }
        }
        return strReturnValue;
    }
}