UiPath-ADPv1 Advanced Data Manipulation Practice Question
Which TWO methods are valid ways to add a new column to an existing DataTable?
⚠ Common exam trap
Candidates often assume that simply defining a variable is enough, forgetting that a DataTable requires a defined schema with column types before data rows can be added.
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
✓
dt.Columns.Add("NewColumnName", GetType(String))
Adding columns to a DataTable at runtime is a common requirement when enriching data during processing. Both the 'Add' method of the Columns collection and the use of 'Invoke Code' are valid ways to achieve this. Knowing these methods allows developers to dynamically expand data structures without needing to define complex schemas in the project design phase, increasing automation flexibility.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
dt.Columns.Add("NewColumnName", GetType(String))
Why this is correct
This is the standard and most efficient way to programmatically add a new column to a DataTable. It allows you to specify both the name and the data type of the column, ensuring the DataTable structure is updated correctly in memory for subsequent row-based data processing tasks.
- ✗
dt.Rows.Add("NewColumnName")
Why it's wrong here
The 'Rows.Add' method is used to add new data records to a table, not to define the schema. Attempting to add a column using this method will result in an error or incorrectly treat the column name as data for the existing row, failing the structural requirement of the request.
- ✗
dt.Columns.Insert("NewColumn")
Why it's wrong here
The 'Columns' collection does not have a method named 'Insert' that takes just a string name. The 'Add' method is the correct way to append a column to the collection. Using 'Insert' will cause a compilation error because the signature does not match any valid method available on the object.
- ✓
Invoke Code with 'dt.Columns.Add("NewColumn")'
Why this is correct
Executing this via Invoke Code is a valid way to modify the DataTable schema. It bypasses the need for specific activity configurations and allows for complex schema modifications, such as setting default values or expressions, which might be required when dynamically building or transforming data structures during runtime.
- ✗
dt.AddColumn("NewColumn")
Why it's wrong here
There is no 'AddColumn' method defined on the DataTable object in the .NET framework. Developers must use the 'Columns.Add' syntax to manipulate the structure. Attempting to use a non-existent method like 'AddColumn' will cause the workflow to fail during compilation or execution due to the missing member reference.
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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-ADPv1 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-ADPv1 exam.