Data at the root level is invalid. Line 1, position 1

If you getting error mention in subject, use the following way to load file:

   
   Dim iXmlDocument As XmlDocument  
   iXmlDocument = Getxmldocument(sFilePath)  
   LoadNodes(iXmlDocument)  
        
   Function Getxmldocument(ByVal sFilePAth As String) As XmlDocument  
   
     Dim xmlDOC As New XmlDocument  
   
     Using myXmlTextReader As New XmlTextReader(sFilePAth)  
       myXmlTextReader.XmlResolver = Nothing  
       Dim settings As XmlReaderSettings = New XmlReaderSettings()  
       settings.ValidationFlags = Schema.XmlSchemaValidationFlags.None  
       settings.ProhibitDtd = False  
       settings.ValidationType = ValidationType.None  
   
       Using reader As XmlReader = XmlReader.Create(myXmlTextReader, settings)  
         result.Load(reader)  
         reader.Close()  
       End Using  
   
       myXmlTextReader.Close()  
       settings = Nothing  
     End Using  
   
     Return xmlDOC  
   End Function  
      
   ' load nodes...  
   Public Function LoadNodes(ByRef xmlFileReader As XmlDocument) As Boolean  
   
     Dim xNodeList As XmlNodeList  
     Dim xNode As XmlNode  
     xNodeList = xmlFileReader.SelectNodes("/Tag1/innerTag1")  
     ......  
     .......  
   End Function