read value from xmlnode returned by asp.net web service

I have developed a web service that accepts an input code and returns data as an XMLnode. The format of the returned XMLnode is attached. I can read the entire returned xmlnode and bind it to a gridview with my attached code. However, I need to be able to read the individual values and my code doesn't seem to work where I am trying to display one particular value as a label (I get null reference exceptions). The web service is located at the following location:

http://transp2.vuse.vanderbilt.edu/webservices/service.asmx

The service is "getprevandnext" and to use it pass a value of "19I0065001" to see what is returned.

If there is a better way to read this data than my current code, please advise.

Thanks for your help!!

'returned data format below
 
<Data>
<PreviousID>94I0065001</PreviousID>
<NextID>83I0065001</NextID>
<LogMile>22.17</LogMile>
</Data>
 
'here is my code, everything works except where noted (Label 4 text)
 
        Dim consumewebservice As New edu.vanderbilt.vuse.transp2.Service
 
        Dim reader As XmlNodeReader
        Dim ds As New DataSet()
        Dim wsNode As XmlNode
 
        wsNode = consumewebservice.GetPrevandNext("19I0065001")
        'the following line does not work
        Label4.Text = wsNode.Attributes("PreviousID").Value.ToString
        
        reader = New XmlNodeReader(wsNode)
 
        ds.ReadXml(reader)
 
        GridView1.DataSource = ds.Tables("Data")
        GridView1.DataBind()
        GridView1.AutoGenerateColumns = True

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