how to delete data from datagridview in windows application

Question

how to delete data from datagridview delete all billno records in Database use  windows application c#

 

ID	Billno	Product name	tax	Total Amount	delete
1`	1	Abc	800	2100	delete
2	2	Xyz	150	1097	delete
3	3	Asd	556	4556565	delete

In Gridview Records

In Database Records

Id	Billno	Product name	Amount	Tax	Total amount
1	1	Abc	500	500	1000
2	1	Abc	800	300	1100
3	1	Abc	1300	800	2100
4	2	Xyz	200	50	250
5	2	Xyz	897	100	997
6	2	xyz	1097	150	1247
7	3	Asd	5000	525	5252