Programmatic Development using Apex and Visualforce in Lightning Experience: DEX-450 Exam

"Programmatic Development using Apex and Visualforce in Lightning Experience", also known as DEX-450 exam, is a Salesforce Certification. With the complete collection of questions and answers, PrepPDF has assembled to take you through 202 Q&As to your DEX-450 Exam preparation. In the DEX-450 exam resources, you will cover every field and category in Salesforce Developer Certification helping to ready you for your successful Salesforce Certification.

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  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Certification Provider: Salesforce
  • Corresponding Certification: Salesforce Developer
  • Updated: Aug 07, 2026
  • No. of Questions: 202 Questions & Answers with Testing Engine
  • Download Limit: Unlimited

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How to book the Salesforce DEX-450 Exam

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Who should take the Salesforce DEX-450 Exam

This course is designed for programme developers starting on the Salesforce platform who require programming customizations on Apex and Visualforce business logic as well as on user interface layers. There are no prerequisites for Salesforce DEX-450 Exam.

  • Programmatic developers.

What is the duration, language, and format of Salesforce DEX-450 Exam

  • Passing score 80%
  • There is a time limit of 120 minutes for the exam.
  • Certification Validity period : 3 years.
  • This exam is offered in only English.
  • The type of questions is Multiple Choice and situation-based questions.
  • This exam consists of 85 questions

The validity of the Salesforce DEX-450 certification is three years.

Benefits in Obtaining Salesforce DEX-450 Certification

71 percent of bachelor's degree expert methodology and energetic methodology certified methodologists receive up to another 16 percent are recorded in the Salesforce annual analytical compensation survey. The certification from Salesforce DEX-450 strengthens your expertise as well as your know-how to ensure that your views are agile in a system of market research. The physical test applicants of the Salesforce DEX-450 certification perceive a fresh advantage on other comrades when being interviewed. In the project market, aspirants find themselves even more aggressive. Salesforce DEX-450 is understood worldwide so that certified aspirants, along with methods of organizational analysis, are simply more self-confident.

The DEX-450 qualification from Salesforce enhances your expertising and expertise to apply an agile perspective within a system of corporate research. At the interview DEX-450 examiners pick a corner over other comrades. In the labour market, aspirants are more competitive.

Reference: https://trailhead.salesforce.com/en/academy/classes/dex450-build-applications-programmatically-on-the-salesforce-platform/

Salesforce DEX-450 Exam Syllabus Topics:

SectionObjectives
Database and SOQL/SOSL- SOQL queries
  • 1. Relationship queries
    • 2. Basic and advanced query filtering
      - DML operations
      • 1. Insert, update, delete, upsert
        • 2. Bulk operations and limits
          Apex Programming Fundamentals- Apex syntax and object-oriented concepts
          • 1. Classes, methods, and variables
            • 2. Access modifiers and encapsulation
              - Collections and data handling
              • 1. Iteration and data manipulation
                • 2. Lists, Sets, and Maps
                  Security and Best Practices- Security model
                  • 1. Sharing rules and with sharing keyword
                    • 2. CRUD and FLS enforcement
                      - Governor limits
                      • 1. Avoiding limit exceptions
                        Testing and Debugging- Debugging techniques
                        • 1. System debug logs
                          - Apex testing framework
                          • 1. Test classes and methods
                            • 2. Code coverage requirements
                              Visualforce Development- Pages and controllers
                              • 1. Standard controllers
                                • 2. Custom controllers and extensions
                                  - UI components
                                  • 1. Visualforce components and expressions
                                    Apex Triggers and Automation- Trigger design patterns
                                    • 1. Bulkified trigger design
                                      • 2. Before and after triggers
                                        - Order of execution
                                        • 1. Salesforce transaction lifecycle

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