I have this XML file

```
<?xml version="1.0" encoding="utf-8"?>
<message>
 <success/>
  <bookings>
   <booking>
     <rooms>
      <room roomCode ="101" uniqueId="abc">
      <stays>
        <stay usedfrom="9:30" usedto="10:30" quantity="1" Price="62.5" rateCode="1"/>
      </stays>
      <extras>
        <extra from="9:30" to="10:30" unitPrice="5.5" extraCode="coffee" quantity="1" inclusive="0"/>
      </extras>
      <guests>
        <guest firstName="John" lastName="Doe" title="MR" ageRange="0"/>
      </guests>
    </room>
    <room roomCode ="Brd" uniqueId="xyz">
      <stays>
        <stay usedfrom="13:30" usedto="15:30" quantity="1" unitPrice="60.0000" rateCode="RACK"/>
      </stays>
      <guests>
        <guest firstName="Jean" lastName="Doe" title="MRS" ageRange="0"/>
      </guests>
    </room>
  </rooms>
</booking>

```

and i'm trying to run a check to make sure its in the correct format (ie certain elements are present).
The code I have been using is 

```
XmlNodeList Successful = doc.GetElementsByTagName("success");
XmlNodeList Bookings = doc.GetElementsByTagName("bookings");
XmlNodeList Booking = doc.GetElementsByTagName("booking");
XmlNodeList Rooms = doc.GetElementsByTagName("rooms");

if ((Successful != null) && (Bookings != null) && (Booking != null) && (Rooms != null))
{
    //do something
}
else
{
    //do something else
}

```

This ALWAYS works thought. 

If I change the one of the values to

```
XmlNodeList Rooms = doc.GetElementsByTagName("NoSuchElement");

```

(which does not exist in the XML) it still "works".

Can someone point out what I've done wrong (I've tried removing the outer brackets from the "if" statement, but this did not change the outcome).

Thanks