Question

Hi I’m having trouble multiplying data retrieved from google finance api. I know that what I’m doing now is wrong so I would like some pointers on how to go about doing that and some examples on that as well.

    string url = "http://www.google.com/ig/api?stock=" + Server.UrlEncode(symbol1.Text);
     XmlDocument xdoc = new XmlDocument();
     xdoc.Load(url);
     currentPrice1.Text = GetData(xdoc, "last");
     int quantity = 50;
     int currentPrice = int.Parse(currentPrice1.Text);
     int totalValue = quantity * currentPrice;

GetData method

private string GetData(XmlDocument doc2, string strElement)
{

    XmlNodeList xnodelist5 = doc2.GetElementsByTagName(strElement);
    XmlNode xnode5 = xnodelist5.Item(0);
    return Get_Attribute_Value(xnode5, "data");

}

ERROR

Answer 1

Might be value of data attribute is non-numeric or not specified. Use TryParse method or wrap up your code with try..catch.. block.

 decimal currentPrice;
 if(decimal.TryParse(currentPrice1.Text, out currentPrice))
  {
     //
   }

Or use int.TryParse if value of data attribute is integer.