InfoPath Dev

I am using VSTA on a InfoPath form and I want to set a value on  a listbox to the first list item.  This list box is retrieving items from a list box on the SharePoint Site.  What I am doing is I have a form that gets the userinfo from Active Directory and populates the form.  There are three items that initially I have to set ...

 I finally figured it out.  I had to change the Date Picker to a string data type.

 Yes the me.CreateNavigator() works.  I got the sample from MS's site. I still have the same problem.  When I changed the format by using dMyDate.ToString("yyy-MM-dd") and then using xnMyForm.SelectSingleNode("/my:SharePointTraining/my:dClassDate", ns).SetValue(dMyDate), I still get the error regard the ...

 I have been having problems trying to set the XPathNavigator in InfoPath form.  If I change the textbox from a date data type to a string data type, it works.  How can I convert or cast the XPathNaigator in InfoPath?  Here is what I have. Dim xnMyForm as XPathnavigator = Me.CreateNavigator Dim ns as XmlNamespaceManager = ...