asp.net - Showing a modal dialog box or form when the application is not running in UserInteractive mode -

showing modal dialog box or form when application not running in userinteractive mode not valid operation. specify servicenotification or defaultdesktoponly style display notification service application.

source error:

line 50:         con.close() line 51:         con.dispose() line 52:         msgbox("item 'item id: " & itemid & "' & 'item name: " & itemname & _ line 53:                "' has been added cart!") line 54:  

i error when run on server..but no error when testing on local machine.