asyn calls with linq to sql using SP

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C#

VB

ASP.NET

I am having a little difficulty trying to make asynchronous calls to a linq to sql using Stored procedures. I really don't know how to start to approach the situation.

this is my regular call to my webservice

<webmethod()> _
       Public Function _LoadPostingArchive() As List(Of _sp_PostingsResult)
      Using db As New postingsDataContext
          Return db._sp_Postings("archive", Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, _
                                  Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, _
                                  Nothing, Nothing, Nothing, Nothing).ToList()
      End Using
  End Function

I am trying to make this call an asynchronous call but like i said I can't find much about this approach I want to make create something scaleable that as my users and data grows I only modify my webservice and the rest of the code is undisturbed

any help if apprciated and if something is not clear please let me know so I can further clarify the questions