Using string and filepath inside a shared function in asp.net not working

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ASP.NET

Hi all ,

I am using a shared web method and it is necessary to be shared.In this webmethod iam reading an html document into a string and replacing some values.But the visual studio is telling me : Cannot refer to an instance member of a class from within a shared method or shared member initializer without an explicit instance of the class.

And here is my code :Note(input and output are strings).

<system.web.services.webmethod()> Public Shared Function GetItems() As String
        If System.IO.File.Exists(filePath) Then

            input = File.ReadAllText(filePath)
        End If
        Dim da As New DSGardlecTableAdapters.PartnersTableAdapter
        Dim dt As New DSGardlec.PartnersDataTable
        Dim dr As DSGardlec.PartnersRow
        dt = da.GetActivePartnersListSorted
        dr = dt.Rows(3)
        output = input.Replace("<%a%>", "/DynamicImages/Partners/thumbnails/" & dr.Partner_Image)
        output = output.Replace("<%Partener_Name%>", dr.Partener_Name)
        output = output.Replace("<%Partener_Link%>", dr.Partener_Link)
        Return output.ToString
    End Function

So how can i call the strings and the filepath through there classes. ?

Thanks in advance.