InfoPath Dev

hello everyone,

I'm unable to select a single node within my xml document :-/
http://msdn.microsoft.com/en-us/library/aa701078.aspx

protected void XmlFormView1_Initialize(object sender, 
   InitializeEventArgs e)
{
    // Create an XPathNavigator positioned at the root of the form's main data source.
    XPathNavigator xNavMain = XmlFormView1.XmlForm.MainDataSource.CreateNavigator();
    // Create an XmlNamespaceManager and add the "my" namespace alias from the form's main data source.
    XmlNamespaceManager xNameSpace = new XmlNamespaceManager(new NameTable());
    xNameSpace.AddNamespace("my", "http://schemas.microsoft.com/office/infopath/2003/myXSD/2006-04-20T16:26:21");
    // Create an XPathNavigator positioned on the form's field2.
    XPathNavigator fTextBox1 = xNavMain.SelectSingleNode("my:myFields/my:field2", xNameSpace);
    // Set the form's field2 to the value in TextBox1.
    fTextBox1.SetValue(TextBox1.Text);
}

First of all... my uri for the "my" namespace is different as Infopath seems to create a new uri for each xml document.
I therefore tried to use xNavMain.LookupNamespace("my")... but that doesn't return much (null).

xNavMain.SelectSingleNode("/myFields/my:forename", xNameSpace); always returns null.

The XML as returned by XPathNavigator xNavMain = XmlFormView1.XmlForm.MainDataSource.CreateNavigator();
 
<?mso-infoPathSolution name="urn:schemas-microsoft-com:office:infopath:MyEmptyTemplateFour:-myXSD-2009-07-05T16-25-14" solutionVersion="1.0.0.13" productVersion="12.0.0.0" PIVersion="1.0.0.0" href="http://portal.litwareinc.com/MyPublishingSite/MyFormsLibrary/MyTestForms/MyEmptyTemplateFour.xsn"?>
<?mso-application progid="InfoPath.Document" versionProgid="InfoPath.Document.2"?>
<my:myFields xml:lang="en-US"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:xhtml="http://www.w3.org/1999/xhtml"
             xmlns:my="http://schemas.microsoft.com/office/infopath/2003/myXSD/2009-07-05T16:25:14"
             xmlns:xd="http://schemas.microsoft.com/office/infopath/2003">
  <my:CbAllowSubmit>true</my:CbAllowSubmit>
  <my:forename></my:forename>
  <my:lastname></my:lastname>
</my:myFields>
 

It looks okay, right? 

I created a small workaround to read the proper uri for the "my" namespace first.
Still I'm wondering if that's the way to go here.

Whenever I have to select a node within code, from either the main data source or a secondary data source, I use the following:

From Main Data Source:

XPathNavigator nav = this.MainDataSource.CreateNavigator();
XPathNavigator node = nav.SelectSingleNode("/my:myFields/my:field1", this.NamespaceManager);

From Secondary Data Source:

Correct. That is if you were using that inside a form's code behind file.
Obviously "this.NamespaceManager" won't be available once you're confronted with the xml output and the xml output only in some other application/environment/solar system for that matter.

If I remember correctly I solved the problem by loading the whole xml data into an XmlDocument and reading the top node's namespace(s). I consider it more as a work around than a viable option but it works nonetheless.