How to reset row number in DataGridView after delete any rows

i am working on a point of sale form of inventory system. suppose there is 5 rows of product add with row number in grid view through barcode scanner like 1 2 3 4 5 i want to delete a product that is at row 3 so how the row number automatically reset after deleting one row?? Values just entered through text boxes in the gridview as show in pic.enter image description here

Thanks in Advance