UiPath-ADAv1 Control Flow Practice Question
A developer needs to repeat a set of activities for every row returned by a Data Table named dtInvoices. The order of processing is important, and each row must be fully processed before the next begins. Which activity should the developer use, and why?
⚠ Common exam trap
The trap here is choosing the parallel iterator for speed when the requirement explicitly demands that each row finish before the next starts, which concurrency cannot guarantee.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
For Each, because it iterates the collection sequentially in index order.
Sequential, ordered iteration over a collection is the purpose of For Each; it processes items in index order and finishes each before moving on. Parallel For Each sacrifices order for concurrency, and the While and Do While loops demand manual indexing and termination logic while offering no native enumeration of a Data Table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
While, because it can loop until the Data Table is empty.
Why it's wrong here
While requires the developer to manage an index or row-removal logic and a termination condition manually, which is error-prone and unnecessary. It does not natively enumerate a Data Table, so it adds complexity without providing the straightforward ordered iteration the scenario calls for.
- ✗
Parallel For Each, because it is faster for Data Table rows.
Why it's wrong here
Parallel For Each does not guarantee order and may interleave rows, so it violates the stated requirement that each row be fully processed before the next begins. Faster throughput is not the priority here; deterministic sequencing is, which makes this the wrong selection for the scenario.
- ✓
For Each, because it iterates the collection sequentially in index order.
Why this is correct
For Each walks the collection in index order and completes each iteration before starting the next, which satisfies the requirement that rows be processed in order and one at a time. It is the standard choice for deterministic, sequential iteration over a Data Table or any IEnumerable.
- ✗
Do While, because it guarantees at least one iteration even for an empty table.
Why it's wrong here
Do While also requires manual index management and, worse, always executes its body at least once, which would process a nonexistent row when the Data Table is empty. That behavior is incorrect for iterating a possibly empty collection and does not natively enumerate rows.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official UiPath exam blueprint
This UiPath-ADAv1 practice question is part of Courseiva's free UiPath certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the UiPath-ADAv1 exam.