Three buttons and one gridview

I may have things set up wrong.  I have the radio button list values as 300, 350 400

So I'm checking for the selected value of the radio button and the request.querystring in the url.  Now in store procedure I have this:  

if @doc = 'F03' 
begin
SELECT 
    doc, 
    COUNT(*) AS cnt
FROM
    (
        Select  
            doc
     FROM pendingdds p
join Offices.dbo.OfficeCodes d
on d.officecode = p.doc
where d.typecode='7' and d.reportsto='F03' 
         Group By 
            doc, clms    ) AS T
GROUP BY 
    doc
end

Do I need to set up a case statement to check for the value of the button that's selected?