You'd probably want to do a postback when the first (and second) drop-downs change and update the next field accordingly. If you don't want it to refresh the whole page, you'd likely be looking at some AJAX.

I see I guess I will look into AJAX then. Thanks for the input

Turns out that the second drop down is not dependant on the first.

Instead.

The gridview is dependant on both of the drop downs, either one or the other, is there a way that I could set up the Grid View so depending on either the first drop down or second drop down to display the infromation.

Lets say after there is a selection in the first drop down the Grid View Changes, and then I change something in the second drop down which couses the grid view to change once again but this time according to the second drop down.

I am thinking maybe something is trigered after the selection in one of the drop downs but I dont know how I would start on this as I am farily new to ASP.NET.

Any help on this would be apreciated.

I haven't really thought this through, but you could have handler for each of the drop downs to do a postback updating the grid view as necessary.