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Old January 12th, 2007, 02:26 PM
Quick209 Quick209 is offline
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For what you are trying to do you can either do it by hand which would encompass too much of this post writing out AJAX by hand or you can use MS AJAX (used to be Atlas).
using MS AJAX is easier and involves you installing the MS AJAX framework along with the toolkit that contains cascading dropdowns. Inside the sample site in the toolkit it shows how to use it that comes with it and you can load it up in VS.

Cut and dry, you will need to build a web service that will access the datasource that contains the data you are cascading. The service should contain the methods to return what the list should show for each condition. The videos are hard to understand and it is easier to look at the sample website as it shows you all the methods and properties for their control and you can look at the source to see how they did it.