Xe currency Convertor using Asp.net Problem

private double GetConvertedCurrencyValue(string inputCurrency, string outputCurrency, double value)
   {
       string request = String.Format("http://www.xe.com/ucc/convert.cgi?Amount={0}&From={1}&To={2}", value, inputCurrency, outputCurrency);
 
       System.Net.WebClient wc = new System.Net.WebClient();
       string apiResponse = wc.DownloadString(request);    // This is a blocking operation.
       wc.Dispose();
 
       /* Formatting */
       // Typical response: "XE.com: curr1 to curr2 rate: x curr1 = y curr2"
       // The first part, up until "x curr1" is basically a constant

 
       string header = String.Format("XE.com: {0} to {1} rate:", inputCurrency, outputCurrency);
 
       // Removing the header
       // The response now looks like this: x curr1 = y curr2
       apiResponse = apiResponse.Replace(header, "");
 
       // Let's split the response at '=', to retrieve the right part
       string outValue = apiResponse.Split('=')[1];
 
       // Getting rid of the 'curr2' part
       outValue = outValue.Replace(outputCurrency, "");
 
       return Double.Parse(outValue, System.Globalization.CultureInfo.InvariantCulture);
   }