public static decimal ConvertCurrency(Dictionary<string, decimal> snapshot, string from, string to, decimal value)
        {
            if (from == "USD")
            {
                decimal valueUsd = snapshot[to] * value;
                return valueUsd;
            }
            else
            {
                decimal valueUsd = (1m / snapshot[from]) * value;
                decimal valueTo = snapshot[to] * valueUsd;
                return valueTo;
            }
        }

        public static Dictionary<string, decimal> ExchangeRateSnapshot()
        {
            Dictionary<string, decimal> db = new Dictionary<string, decimal>();
            string url = "http://finance.yahoo.com/webservice/" + "v1/symbols/allcurrencies/quote?format=xml";
            try
            {
                // Load the data.
                XmlDocument doc = new XmlDocument();
                doc.Load(url);

                // Process the resource nodes.
                XmlNode root = doc.DocumentElement;
                string xquery = "descendant::resource[@classname='Quote']";
                foreach (XmlNode node in root.SelectNodes(xquery))
                {
                    const string name_query =
                        "descendant::field[@name='name']";
                    const string price_query =
                        "descendant::field[@name='price']";

                    string name =
                        node.SelectSingleNode(name_query).InnerText;
                    string price =
                        node.SelectSingleNode(price_query).InnerText;
                    decimal inverse = 1m / decimal.Parse(price);

                    if (name.StartsWith("USD/"))
                        if (!db.ContainsKey(name.Replace("USD/", "")))
                        {
                            db.Add(name.Replace("USD/", ""), decimal.Parse(price));
                        }
                }
            }
            catch (Exception ex)
            { }

            return db;
        }