What is the difference between ViewBag, ViewData, and TempData?
PICTURE THIS: PYTHON TYPES
Simple meaning
ViewData is a dictionary for this request
WHY — ViewData instead of guessing?
Why interviewers care about ViewData:
contrast on ViewData, not two memorised paragraphs.
the developer, then one case where picking wrong hurts.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1ViewData is a dictionary
for this request
- 2ViewBag is a dynamic
wrapper over it.
- 3TempData survives one extra
request, often after a redirect, using session.
- 4I prefer a strongly
typed view model over ViewBag for anything the view always needs.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
ViewData is a dictionary for this request ViewBag is a dynamic wrapper over it.