xml error: Object reference not set to an instance of an object after SelectSingleNode
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        Published on 2010-04-14T19:30:50Z
        Indexed on 
            2010/04/14
            19:53 UTC
        
        
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here's my code:
XmlDocument doc = new XmlDocument();
foreach (string c in colorList)
{
     doc.Load(@"http://whoisxmlapi.com/whoisserver/WhoisService?domainName=" + c + @"&username=user&password=pass");
     textBox1.Text += doc.SelectSingleNode("WhoisRecord/registrant/email").InnerText + ",";
}
for the second line of code (textbox1...) is generating this error what am i doing wrong?
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