Regarding Navigation buttons

Dear All,
I tried following code for use Navigation buttons. But it not working. It gives error "Object reference not set to instance of an object" Can anybody tell me what is wrong in that or any file want to include for that or is there another method for use Navigation buttons?
Plz suggest me how to solve this error ?
if (pVal.MenuUID == "1282" || pVal.MenuUID == "1288" || pVal.MenuUID == "1289" || pVal.MenuUID == "1290" || pVal.MenuUID == "1291")
                if (pVal.BeforeAction == false)
                        try
                            switch (pVal.MenuUID)
                                case "1288":
                                   // oForm.DataBrowser.BrowseBy = "PR_Date";
                                    oRecordSet.MoveNext();
                                    //// If reached EOF show next
                                    if (oRecordSet.EoF == true)
                                        oRecordSet.MoveLast();
                                    break;
                                case "1289":
                                    oRecordSet.MovePrevious();
                                    //// If reached EOF show previous
                                    if (oRecordSet.EoF == true)
                                        oRecordSet.MoveFirst();
                                    break;
Regards,

Dear Friend,
Plz suggest me any solution. How to use that one. Is there is another code plz give me ?
It's urjant. How to solve it ?
Regards

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