No limit of time, no limit of location. The Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience material from ValidVCE runs on any electronic equipment — 202 practice questions for the DEX-450 exam, wherever 2026 takes you.
Salesforce DEX-450 Exam Overview:
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Programmatic Development using Apex and Visualforce in Lightning Experience |
| Exam Number: | DEX-450 |
| Passing Score: | 65%–80% |
| Exam Format: | Scenario-based, Multiple Select, Multiple Choice |
| Exam Price: | $200 USD |
| Exam Duration: | 105–120 |
| Related Certifications: | Salesforce Platform Developer II |
| Available Languages: | English |
| Real Exam Qty: | 60–85 |
| Certificate Validity Period: | 3 years |
| Recommended Training: | Build Applications Programmatically on the Salesforce Platform (DEX450) |
| Exam Registration: | Salesforce Certification Portal |
| Sample Questions: |  |
| Exam Way: | Online proctored or onsite testing center |
| Pre Condition: | Understanding of declarative development; experience with object-oriented programming; completion of recommended training or equivalent knowledge |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/platform-developer-i |
Salesforce DEX-450 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Apex Classes, Triggers, and Execution | 20% | - Class structure, methods, and access modifiers
|
| Topic 2: Data Retrieval and Manipulation | 20% | - SOQL and SOSL queries
|
| Topic 3: Apex Programming Fundamentals | 25% | - Apex syntax, data types, and control structures
|
| Topic 4: Visualforce Development | 15% | - Page creation and standard controllers
|
| Topic 5: Data Modeling and Management | 20% | - Custom objects, fields, and relationships
|
Salesforce DEX-450 Exam: Common Questions
The Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience blueprint spans 5 domains — including Data Retrieval and Manipulation (20%), Apex Programming Fundamentals (25%), Apex Classes, Triggers, and Execution (20%). Weightings show where the exam concentrates; the full outline above covers every subtopic.
Through the vendor's official registration channels:
The Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience is delivered Online proctored or onsite testing center — choose the arrangement that suits you when booking.
$200 USD per attempt, 65%–80% to pass. Every retake bills the full fee, so make practice thorough first — the 202 practice questions for the DEX-450 exam at ValidVCE are the affordable rehearsal.
Delivery is instant — an automatic email within a minute of payment, unlimited installations, and 24/7 customer assisting for downloading or purchasing problems if nothing arrives within 2 hours. If you fail the corresponding DEX-450 exam within 60 days of purchase, pick your remedy: a full refund (email a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam; after confirmation, processed within 7 days), waiting for the next updated version free, or a free change to two other equal-value dumps. Excluded: exams within 3 days of purchase, candidate names that don't match the payer, and free or expired products.
Yes:
Training covers theory; interactive practice covers readiness. After any course, rehearse with the 202 practice questions for the Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience — every answer expert-verified.
The Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience is Salesforce's certification exam for Salesforce Platform Developer I, at the Professional level. It demonstrates verified, job-relevant capability to employers. Related credentials include Salesforce Platform Developer II.
105–120 for 60–85 questions. Rehearse the format interactively: the ValidVCE online engine recreates the test atmosphere, so pacing is trained before it counts.
Yes — a free Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience demo is available to download on our exam page. Evaluate the material yourself; purchases include 365 days of free updates, emailed immediately upon release, renewable at 50% off afterward.
Understanding of declarative development; experience with object-oriented programming; completion of recommended training or equivalent knowledge Eligibility rules change from time to time, so confirm the current requirements on the official page (official DEX-450 exam page) before booking.
Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions:
A Primaryld_c custom field exists on the Candidate _c custom object. The field is used to store each candidate's id number and is marked as Unique in the schema definition.
As part of a data enrichment process, Universal Containers has a CSV file that contains updated data for all candidates in the system. The file contains each Candidate's primary .. as a data point. Universal Containers wants to upload this information into Salesforce, while ensuring all data rows are correctly mapped to a candidate in the system.
Which technique should the developer implement to streamline the data upload?
- A. Create a before insert trigger to correctly map the records,
- B. Upload the CSV into-a custom object related to candidate__c.
- C. Create a before save flow to correctly map the records.
- D. Update the Primarytd_c field definition to mark it. as.an External Id.
Correct Answer: D 🗳️
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What should a developer use to script the deployment and unit test execution as part of continuous integration?
- A. Salesforce CLI
- B. Developer Console
- C. Execute Anonymous
- D. VS Code
Correct Answer: A 🗳️
A developer created a trigger on a custom object. This custom object also has some dependent pick lists.
According to the order of execution rules, which step happens first?
- A. JavaScript validation is run in the browser,
- B. The original record is loaded from the database.
- C. Old values are overwritten with the new record values.
- D. System validation is run for maximum field lengths.
Correct Answer: B 🗳️
A developer is asked to write helper methods that create test data for unit tests.
What should be changed in the Testutils class so that its methods are only usable by unit test methods?
What should be changed in the TestUtils class so that its methods are only usable by unit test methods?
- A. Remove static from line 03.
- B. @isTest above line 03.
- C. Change public to private on line 01.
- D. Add @istest above line 01.
Correct Answer: B 🗳️
A developer is alerted to an issue with a custom Apex trigger that is causing records to be duplicated.
What is the most appropriate debugging approach to troubleshoot the issue?
- A. Add system.debug statements to the code to track the execution flow and identify the issue.
- B. Use the Apex Interactive Debugger to step through the code and identify the issue.
- C. Review the Historical Event logs to identify the source of the issue.
- D. Disable the trigger in production and test to see if the issue still occurs.
Correct Answer: A 🗳️
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