VS 2008 edit, add, delete data in datagridview

i have connected my sdf database to vb.net and program is capable to show the database in the datagridview. but what i want is when i change the data in the datagridview and click onto update button,changes i made should be saved in database so when i execute the application again i should be able to see the updated database in the datagridview.
guide me to add data as well as to delete data too
pls help me !!