the problem is that i have a screen on which some data are displayed with checkboxes in front of when the user check multiple boxes the data checked by the user should goto a table in the database and verify whether the data checked exists as a data in the table or not.if doesnot exist then on new page that selected data should be displayed with a add button in front of it if data is present as a data in the table then it should also be displayed with an remove button in front of it.i hope u understand what i mean.