multiple checkboxes can b deleted

Question

hi
i m usin a datagridview and used a checkbox in it. when i select a check box i want to delete it. i could not delete a row until i click on another cell after selecting a cell.then i used cureentcelldirtystatate and i succesfully deleted the row but ths happen for single cell when i select mu;tiple cells and want to delete it then it delete only a few rows and leave 2 or 3 rows left same.
plz help me