generate new grid dynamically

hi

i have a problem. i have two fields product and Quantity. when i fill the product and give the quantity 1-4
for example

shoes    1
shoes    2
shoes    3
shoes    4
bag        5
bag        6

so i have a gridview. but i want to show the products in gridview nearabout  30 but suppose bag has a quantity 25-33 then it not show in the next grid but it show in the same grid and when a new product is added then a new grid is generated and both show at same time . anyone give me the code for this in asp.net using c#

can anyone help me for my problem

thanks
keshav