UiPath-ADAv1 Studio Interface and Variables Practice Question
You are working on a UiPath automation project where you have a variable named 'TransactionAmount' of type Double defined in the Main workflow. You need to pass this value to an invoked workflow called 'ProcessTransaction.xaml' which expects a Double argument named 'Amount'. How should you configure the Invoke Workflow activity?
⚠ Common exam trap
The trap here is thinking you need to convert the Double to a String or perform an explicit cast, but UiPath handles type matching automatically when the types are compatible.
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
✓
In the Invoke Workflow activity, set the 'Amount' argument to the value of 'TransactionAmount' by using the expression 'TransactionAmount'.
To pass a variable's value to an invoked workflow's argument, you map the argument to the variable in the Invoke Workflow activity. The data types must match. Using 'TransactionAmount' directly is correct because it is already a Double. Converting to String or using redundant conversion is unnecessary and can cause errors or confusion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
In the Invoke Workflow activity, set the 'Amount' argument to the value of 'TransactionAmount' by using the expression 'TransactionAmount'.
Why this is correct
The Invoke Workflow activity allows you to map arguments of the invoked workflow to values in the current workflow. By setting the 'Amount' argument to the expression 'TransactionAmount', you pass the value of the variable to the argument. This is the standard way to share data between workflows. The argument direction in the invoked workflow should be 'In' to receive the value.
- ✗
In the Invoke Workflow activity, set the 'Amount' argument to the value of 'TransactionAmount' by using the expression 'CDbl(TransactionAmount)'.
Why it's wrong here
CDbl converts a value to a Double, but 'TransactionAmount' is already a Double. While this conversion is redundant, it is not incorrect in terms of type. However, it is unnecessary and could introduce confusion. The simplest and most direct way is to use 'TransactionAmount' directly. The exam expects the most straightforward correct answer, which is without redundant conversion.
- ✗
In the Invoke Workflow activity, set the 'Amount' argument to the value of 'TransactionAmount' by using the expression 'TransactionAmount.ToString'.
Why it's wrong here
Using 'TransactionAmount.ToString' would convert the Double value to a String, which does not match the expected Double type of the 'Amount' argument. This would cause a compilation error because the types are incompatible. The Invoke Workflow activity requires that the data types of the argument and the assigned expression match. Therefore, this option is incorrect.
- ✗
In the Invoke Workflow activity, set the 'Amount' argument to the value of 'TransactionAmount' by using the expression 'CStr(TransactionAmount)'.
Why it's wrong here
CStr converts a value to a String, so again this would result in a type mismatch. The 'Amount' argument is of type Double, and passing a String would not be valid. UiPath Studio enforces type safety at design time, so this expression would be flagged as an error. The correct approach is to pass the Double variable directly without conversion.
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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.