asp.net - Update command not throwing any errors, but not working either -

update button executes onclick="updatelogo", nothing shows in database. know executes because can put other instruction refresh or redirect page, , executes, doesn't update. tried using commandname property instead of onclick property, no luck there either. thoughts why?

i've moved in , out of updatepanel , can see i've got inside formview right now. i've tried couple of variations on variables @atty_id or ?, can't seem work.

here markup:

<asp:updatepanel id="updatepanel19" runat="server">                     <contenttemplate>                         <asp:accessdatasource id="chamberlogodatasource" runat="server"                            datafile="~/app_data/attorneys.mdb"                            selectcommand="select attorneys.chamber attorneys atty_id = ?"                           updatecommand="update attorneys set chamber = ? att_id = ?">                           <selectparameters>                             <asp:querystringparameter name="atty_id" querystringfield="att_id" />                           </selectparameters>                           <updateparameters>                             <asp:parameter name="chamber" />                             <asp:parameter name="atty_id" />                           </updateparameters>                         </asp:accessdatasource>                          <asp:formview id="formview3" runat="server"                              datasourceid="chamberlogodatasource" defaultmode="edit">                             <edititemtemplate>                                 add chambers logo:<br />                                 <asp:textbox id="textbox2" runat="server" textmode="multiline" rows="5" columns="50" text='<%# bind("chamber") %>'></asp:textbox>                                 <asp:button id="updatechamberslogobutton" runat="server" text="update" onclick="updatelogo" />                             </edititemtemplate>                         </asp:formview>                     </contenttemplate>                 </asp:updatepanel> 

and here code behind:

protected sub updatelogo(byval sender object, byval e system.eventargs)     chamberlogodatasource.update() end sub 

if go record in database has value chamber, shows in textbox should. if blank , put in there , click button, doesn't updated. if change text there , click button, nothing updates either. i'm kinda lost on one, since there similar code elsewhere on page.