gridview view help

Hi guys
I am populating  gridview on page_load with a query.  on conition that desp_flag=0;
On update button click i am updating the db field  desp_flag=1;
so on button click that gridview row should be removed from gridview at that time
Acc0rding to my query desp_flag=0 record will be displayed in gridview
On buttonclick it should be appeared that it vanished. from girdview.
how to do it.