Retrieving optional nodes from an XmlDocument

I have some Xml documents which i want to parse into C#, but they have many optional nodes that may or may not be there.
For example




How can i retrieve these single nodes quickly from Xml using c#?

I have been using .SelectSingleNode("//name/firstname") etc but these throw an exception if the node is not there.  Exceptions are pretty computationally expensive so i want to find a better way of finding out if a node exists in an xml document.

In summary, if i have an xml document which has lots of optional nodes, what is the best way to program my C# to use the values in these nodes if they exist.

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The easiest way to do is to check if the node is null after you select it:

XmlNode node = xmlDoc.SelectSingleNode("//name/firstname");
if(node != null)
   // The node exists, do something with it
   // The node does not exist, do something else

You could always loop through your complete XML using recursion, but it really depends on the situation if you need that.



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mt600Author Commented:
ok, thanks for your help.  It's good enough for me.

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