datagridview refresh

Question

i have to two forms one is customers and second is addcustomers
on customers i have a datagridview on  customers load function i select records form database
and populate in datagridview.
but on addcustomers form i want when i press add button after saving recored in database it
updates the datagridview id customers form
because all the customer added no shown in datagridview till i reload the form.
but i want get rid of it. plz help me.