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

  • Exam Code: DEX-450
  • Exam Name: Programmatic Development using Apex and Visualforce in Lightning Experience
  • Updated: Aug 13, 2026
  • Q & A: 202 Questions and Answers

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

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Preparation Guide for Salesforce DEX-450 Exam

Introduction

Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.

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Salesforce DEX-450 Exam Syllabus Topics:

SectionObjectives
Topic 1: Testing and Debugging- Apex testing framework
  • 1. Test classes and methods
    • 2. Code coverage requirements
      - Debugging techniques
      • 1. System debug logs
        Topic 2: Visualforce Development- UI components
        • 1. Visualforce components and expressions
          - Pages and controllers
          • 1. Standard controllers
            • 2. Custom controllers and extensions
              Topic 3: Apex Triggers and Automation- Order of execution
              • 1. Salesforce transaction lifecycle
                - Trigger design patterns
                • 1. Before and after triggers
                  • 2. Bulkified trigger design
                    Topic 4: Database and SOQL/SOSL- DML operations
                    • 1. Insert, update, delete, upsert
                      • 2. Bulk operations and limits
                        - SOQL queries
                        • 1. Basic and advanced query filtering
                          • 2. Relationship queries
                            Topic 5: Apex Programming Fundamentals- Apex syntax and object-oriented concepts
                            • 1. Access modifiers and encapsulation
                              • 2. Classes, methods, and variables
                                - Collections and data handling
                                • 1. Lists, Sets, and Maps
                                  • 2. Iteration and data manipulation
                                    Topic 6: Security and Best Practices- Governor limits
                                    • 1. Avoiding limit exceptions
                                      - Security model
                                      • 1. CRUD and FLS enforcement
                                        • 2. Sharing rules and with sharing keyword

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