SqlDataSource and DataView

[Camel]

Hi,

I'm just learning the new databinding paradigm in ASP.NET 2 and I have
a question. What if I want to use 1 SqlDataSource for 2 comboboxes?

What I want is a master/detail relationship between the 2 comboboxes.
That is, the value in combobox A filters the values shown in combobox
B. My first thought is to load the data once (via a SqlDataSource),
turn the caching feature on and filter the data using a DataView.

This presents 3 problems :
1) I haven't figured out how to use a DataView with a SqlDataSource yet
2) Web Developer Express 2005 appears to have no DataView visual
component
3) Is there a better way or more ASP.NET 2 way of doing this?

I'd appreciate any pointers

Regards,

Camel