when an item is selected from dropdownlist ,then the same item will not show while we want to select other item using other dropdownlist.
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Could you please give more details. Where does this happen? What values do you want to select and save?
For example while applying for a course we have to select maximum 3 courses in a priority order 1. select a course 2. select a course 3. select a course in such a way that once a course is selected then same course needn't to display in the following dropdownlists.