Using a combobox to update the content in another combobox.

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VB

ASP.NET

jQuery

combobox

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I have been cracking my head for the last 4 days trying to get the comboboxes to work. I'm trying to convert an existing client app into web and one of the feature of the client app is having a combobox to allow them to enter data that are not in the system. But if they select or entered an existing data then the system would populate another combobox with a set of relevent data pertaining to the initial data. As aspx does not have combobox, has to use jquery. Having lots of problem trying to do the postback. Managed to do the postback but doesn't seems to be able to get the info populated to the other combobox. Can someone help? Please!