How to decide to use ComboBox control instead of a ListBox?

  1. If you want the user to be able to add items, use a ComboBox.
  2. If the form has a large number of input fields, and space is at a premium, use a ComboBox.
  3. If the list being manipulated contains only a few items and those items will not change, use a ListBox.
  4. If the list contains a very large number of items, and the user will select from the items on one form to load another from, use a ListBox.

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