Xe currency Convertor

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ASP.NET

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);
   }

it gives an below error in last line .please reply immediately......


Input string was not in a correct format.