i am using asp.net 2003 and vb.net
i have one dropdownlist
in which i am showing different products

different products has different sizes and different colors
when i choose product from dropdonlist
details of product shows in datagrid
i need to create matrix using datagrid  in which rows will be depend upon color
and sizes
like
color/size Small Medium Large
Blue 50 25 5
White 10 28 18
Green 15 10 5
50,25,5, 10 etc are qty of that products
like product in small size and blue color are in 50 qty
how can i change the matrix depend upon products color and size ?
second problem is
cells of qty must be editable
user should be able to edit any cell
and put qty of that color and size combination

and i want only one update button
by pressing this button
all the values of qty of color and size must be update