Returning PK of gridview when updating or inserting (ASP.NET, C#) -

i require changes such inserts, updates , deletes table auditted, , i'm using simple sqldatasource , gridview automagically generated insert/update/delete statements. problem is, when row updated want id (primary key) , put auditting table - because parameters update query actual data , not primary key, don't know how access information. here update query:

insertcommand="insert [nominalcode] ([vaxcode], [reference], [costcentre], [department], [reportingcategory]) values (@vaxcode, @reference, @costcentre, @department, @reportingcategory)"  

and here codebehind auditting:

protected void sqldatasource1_updating(object sender, sqldatasourcecommandeventargs e)     {         string fields = e.command.parameters[0].value.tostring() + "," + e.command.parameters[1].value.tostring() + "," + e.command.parameters[2].value.tostring() + "," + e.command.parameters[3].value.tostring() + "," + e.command.parameters[4].value.tostring();         system.security.principal.  windowsprincipal p = system.threading.thread.currentprincipal system.security.principal.windowsprincipal;         string[] namearray = p.identity.name.split('\\');         string name = namearray[1];         string querystring = "insert audit (source, action, item, userid, timestamp) values (@source, @action, @item, @userid, @timestamp)";         using (sqlconnection connection = new sqlconnection("con string removed privacy"))         {             sqlcommand command = new sqlcommand(querystring, connection);             command.parameters.addwithvalue("@source", "nominal");             command.parameters.addwithvalue("@action", "update");             command.parameters.addwithvalue("@item", fields);             command.parameters.addwithvalue("@userid", name);             command.parameters.addwithvalue("@timestamp", datetime.now);             connection.open();             try             {                 command.executenonquery();             }             catch (exception x)             {                 response.write(x);             }                         {                 connection.close();             }         }     } 

okay, feel stupid. id located in clause of sql query of course! , pasted in insert command reason.