With the following code, how can I adjust it to detect the presence of the node? Because if tcTag does not exist, this will generate an object reference not set on the cXML line.

    ' Get a XML node value
    ' expC1 XML
    ' expC2 Tag
    Public Function GetXMLNodeValue(ByVal tcXML As String, ByVal tcTag As String) As Boolean
        Dim llSuccess As Boolean
        oDOM.LoadXml(tcXML)
        oNode = oDOM.SelectSingleNode(tcTag)
        Try
            cXML = oNode.InnerText
            llSuccess = True
        Catch loError As Exception
            App.ErrorSetup(loError)
        End Try
        Return llSuccess
    End Function

Basically, I would like to know if oNode has been properly initialized. If not, I can adjust the code before the Try.