I have a webservice defined here:
/app/AutocompleteManager.asmx
[WebMethod]
public string AutocompleteComposers()
{
  return "hey, what's up";
}
I want to call it using the GET method with extra parameters.
If I just go /app/AutocompleteManager.asmx?q=something, it won't work because I don't have the action specified.
If I go /app/AutocompleteManager.asmx/AutocompleteComposers?q=something it breaks. 
Any idea?
Right click on Connected Services folder (should appear just below your project) and select Add Connected Service. Then select "Add a WCF web service". Put your asmx url into the URI field, set the name space and click Finish. You will now have the reference set.
Change your web.config like so:
<system.web>
    ...
    <webServices>
        <protocols>
              <add name="HttpSoap"/> 
              <add name="HttpPost"/>
              <add name="HttpGet"/>
        </protocols>
    </webServices>
</system.web>
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