InfoPath Dev

I am new to InfoPath developing, so I hope that someone can help.  I have an InfoPath 2007 form that recieves data from a web service for a given patient.  I have a web application ( C#, Visual Studio 2005 ) that opens the InfoPath form and I want to pass it the patient number.  My code looks like this so far:

Document = IP.XDocuments.NewFromSolution(FormPathUri.AbsoluteUri);

Document.DOM.selectSingleNode("/dfs:myFields/dfs:queryFields/tns:DatabaseToXMLFile/tns:Pat_no").text = Pat_No;

I need a line of code to specify the namespaces used in the selectSingleNode line.  What should it be?  I have tried lots of things without success, so I will be very grateful for your advice.

Thanks,

I believe you just need the namespaces from the form you just opened. At least that is what I usually do is just copy the namespaces from the form into the code.

Hello Clay

Thanks for replying.  I have the namespaces from the form, I'm just not sure how to set them in the code.  I tried:

Document.DOM.setProperty("SelectionNamespaces", "xmlns:dfs=\'http://schemas.microsoft.com/office/infopath/2003/dataFormSolution\' xmlns:tns=\'http://tempuri.org/\'");

But this gives an error: 'Microsoft.Office.Interop.InfoPath.Xml.IXMLDOMDocument' does not contain a definition for 'setProperty'

I can't find the correct code anywhere.  Can you help, please?

Regards

Helen