Hi,
I'm a little fuzzy on what you mean by "select". Do you mean you want the user to select a Product Class in each row of the grid, and then a Product Line in the next cell of the same row, but only show the Product Lines that apply to that Product Class?
Or are you talking about showing all of the data and only letting the user select certain rows by highlighting them?
Or do you mean you want a CheckBox in the rows?
peryan77 said:Should I keep product line and product class outside the grid in combo box?
There are any number of ways you could do this. It depends how many things your users need to select. Do you really need a grid with multiple Product Classes? Or do you just need one? If you only need one, then it would seem reasonable to use a ComboBox. If they need to create a list, then a grid makes sense. In the latter case, maybe the therapeutic / indications could be child rows in the grid.
Sorry if my answer is a bit vague, but you seem to be asking more about how your application should be organized than about how to use the controls. And that's not really something I can discuss intelligently, since I don't know your application needs.