UiPath-ADAv1 Files, Folders, and Data Manipulation Practice Question
When extracting a specific column from a DataTable into an array, which method provides the most concise and efficient syntax?
⚠ Common exam trap
Candidates often attempt to iterate through the DataTable using a For Each row activity and manually adding items to a List, which is inefficient, verbose, and prone to indexing errors.
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
✓
Use LINQ: DataTable.AsEnumerable.Select(Function(row) row("Col").ToString).ToArray().
Using LINQ's 'Select' method on a DataTable's Rows collection allows for a direct projection to an array. This is the idiomatic way to handle column extraction in .NET and UiPath, providing both readability and speed. By using 'AsEnumerable().Select(Function(r) r("ColumnName").ToString()).ToArray()', you avoid manual loops and temporary variable management, resulting in cleaner and more maintainable code that effectively isolates data for subsequent processing tasks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a 'For Each' activity to iterate and assign values to an array.
Why it's wrong here
Manual iteration is verbose and requires initializing an array and managing an index variable. This approach is prone to off-by-one errors and is less efficient than LINQ projections, which are specifically designed to handle data transformations concisely without needing manual state management or explicit loop structures in the workflow code.
- ✗
Use the 'Filter Data Table' activity.
Why it's wrong here
The 'Filter Data Table' activity is designed to remove rows, not to project a single column into an array structure. While it can be used to select specific columns, the output is another DataTable, not an array of values. Converting this DataTable result to an array adds unnecessary complexity to the workflow.
- ✓
Use LINQ: DataTable.AsEnumerable.Select(Function(row) row("Col").ToString).ToArray().
Why this is correct
This LINQ projection is the standard, optimized way to extract column data in UiPath. It is concise, readable, and executes efficiently in memory. By avoiding loops, it reduces the risk of errors and keeps the codebase clean, which is a fundamental requirement for scalable and professional-grade RPA development practices.
- ✗
Use the 'Read Range' activity with a specific range.
Why it's wrong here
The 'Read Range' activity retrieves data from a file, not from an existing DataTable object. Using it to extract a single column would require extra file operations, which is fundamentally inefficient for data that is already available in the workflow's memory as a DataTable object, leading to unnecessary I/O overhead.
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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.