How to get specific culture currency pattern

A CultureInfo contains a NumberFormatInfo and this class describes (among other things) how to format currency for that particular culture.

In particular you can use CurrencyPositivePattern and CurrencyNegativePattern to determine if the currency symbol is placed before or after the amount and of course CurrencySymbol to get the correct currency symbol. All this information is used by .NET when the C format specifier is used.

You can read more about the NumberFormatInfo class on MSDN.

The code below demonstrates some of the steps required to format currency properly. It only uses CurrencySymbol, CurrencyPositivePattern and CurrencyDecimalDigits and thus is incomplete:

var amount = 123.45M;
var cultureInfo = CultureInfo.GetCultureInfo("da-DK");

var numberFormat = cultureInfo.NumberFormat;
String formattedAmount = null;
if (amount >= Decimal.Zero) {
  String pattern = null;
  switch (numberFormat.CurrencyPositivePattern) {
    case 0:
      pattern = "{0}{1:N" + numberFormat.CurrencyDecimalDigits + "}";
      break;
    case 1:
      pattern = "{1:N" + numberFormat.CurrencyDecimalDigits + "}{0}";
      break;
    case 2:
      pattern = "{0} {1:N" + numberFormat.CurrencyDecimalDigits + "}";
      break;
    case 3:
      pattern = "{1:N" + numberFormat.CurrencyDecimalDigits + "} {0}";
      break;
  }
  formattedAmount = String.Format(cultureInfo, pattern, numberFormat.CurrencySymbol, amount);
}
else {
  // ...
}

Console.WriteLine(formattedAmount);

Of course you could simply use:

var amount = 123.45M;
var cultureInfo = CultureInfo.GetCultureInfo("da-DK");
var formattedAmount = String.Format(cultureInfo, "{0:C}", amount);
Console.WriteLine(formattedAmount);

The test below illustrates how you can achieve this:

    [Test]
    public void DisplayEurosInGreeceAndEngland()
    {
        var val = 125.22m;
        Thread.CurrentThread.CurrentCulture
            = Thread.CurrentThread.CurrentUICulture
              = new CultureInfo("el-GR");

        Console.WriteLine(string.Format("{0:n} €", val));

        Thread.CurrentThread.CurrentCulture
            = Thread.CurrentThread.CurrentUICulture
              = new CultureInfo("en-GB");

        Console.WriteLine(string.Format("{0:n} €", val));
    }

By using the standard decimal notation from the currently selected culture, you can display any given value skipping the currency, which you can treat separately.