InfoPath Dev

Hi all, 

I use vb to get data through my form. I have some optional fileds in my form and I have this problem with the following code:

 MsgBox(myXPathNavigator.SelectSingleNode("/my:Status/my:Questions/my:Questions1", _
                       Me.NamespaceManager).IsNode.ToString)

 When the optional filed 'Questions1' is inserted to the form I get the value 'true' by the IsNode function. If the field it is not inserted I have an exception,

stating that the reference is not correct (and it is indeed true). Is there a way to verify about a node, whether it is present or not in my form?

Thanks in advance,

Sun

A workaround would be

try

{

isnode= myXPathNavigator.SelectSingleNode("/my:Status/my:Questions/my:Questions1", _
                       Me.NamespaceManager).IsNode.ToString

}

catch (Exception ex)

{

isnode =false

}

if (isnode)

{

//action if present

}

else

{

//action if not present

}

 Thanks for the answer.

I found another way as follows, just verifying or not the node:

Dim q As XPathNavigator
Dim path as String

path = "/my:Status/my:Questions/my:Questions1"
q = myXPathNavigator.SelectSingleNode(path, Me.NamespaceManager)

If Not q Is Nothing Then
  MsgBox(q.ToString)
End If

 The IsNode property is a bit of a pointless property because it is always true.  I think it's more conventional to check whether the result of SelectSingleNode() is null (or Nothing in vb).  You don't really need a try...catch block.  Try this:

 MsgBox((myXPathNavigator.SelectSingleNode("/my:Status/my:Questions/my:Questions1", _
                       Me.NamespaceManager) Is Nothing).ToString)