I want to manage a list of associations in a web form. A "submission" can be assigned multiple "categories" from one "project". So if there's no assignment yet, a project needs to be selected first. This can be done by a simple drop-down list. But then, multiple categories can be assigned. (This is also the case when editing a submission that already has one or more categories assigned.) I'd like to get it all on one page, just using auto-postback and a final Save button to permanently save the associations, along with data from other static input fields for the submission. Single categories must be removable again, either by selecting a "none" value from the list or by pressing a button besides each drop-down list control, labelled "remove this item". All other input data on the page must remain intact through the viewstate.
How can I do that? In the page source editor / designer I can only add single controls wh ...
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