Understanding lists in InfoPath
If you have been struggling to understand how list boxes (drop-down list boxes, combo boxes, list boxes, and multi-select list boxes) work in InfoPath, I’ve just published the following article on understanding list basics: InfoPath Basics: List control basics in InfoPath.
How to look up the display name of the selected item in a drop-down list box
If you are familiar with Excel and ever wanted to simulate Excel’s VLOOKUP function in InfoPath, I’ve just published the following article on how to do this: How to simulate Excel’s VLOOKUP function in InfoPath to look up data in a secondary data source using rules and filters. This technique can be used to lookup the display name of the selected item in a drop-down list box that is bound to a secondary data source.
You can find more articles about list boxes on the InfoPath Tutorials: Use List Boxes in InfoPath page.

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