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Currency Formatting in C#

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The code queries the cultures using linq to find a culture matching the given currency code it then uses passes the culture into string.Format and asks it to format as currency (”C”).

public static  string FormatCurrency(this decimal  amount, string  currencyCode)
{
    var culture = (from c in  CultureInfo.GetCultures(CultureTypes.SpecificCultures)
            let r = new  RegionInfo(c.LCID)
            where r != null
            && r.ISOCurrencySymbol.ToUpper() == currencyCode.ToUpper()
            select c).FirstOrDefault();
 
    if (culture == null)
        return amount.ToString("0.00");
 
    return string.Format(culture, "{0:C}", amount);
}

Here are the results of calling FormatCurrency for a few different currency codes:

decimal amount = 100;
 
amount.FormatCurrency("AUD");  //$100.00
amount.FormatCurrency("GBP");  //£100.00
amount.FormatCurrency("EUR");  //100,00 €
amount.FormatCurrency("VND");  //100,00 ₫
amount.FormatCurrency("IRN");  //₹ 100.00