asp.net webmethod session

Using ASP.NET Session State in a Web Service
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How can I access session in a webmethod?
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重點底下寫法:

EnableSession:=True

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  _
    Public Function IncrementSessionCounterX() As Integer
        Dim counter As Integer
        If Context.Session("Counter") Is Nothing Then
            counter = 1
        Else
            counter = Context.Session("Counter") + 1
        End If
        Context.Session("Counter") = counter
        Return counter
    End Function