Mastery in DotNet Development — Lesson 3: Web APIs, Security, and Integration

Learning Objectives

• Build ASP.NET Core APIs with routing, models, validation, middleware, and OpenAPI documentation
• Implement authentication, authorization, secrets, configuration, and secure data handling
• Integrate databases, external APIs, messaging, caching, and background processing

Detailed Topics

• Build ASP.NET Core APIs with routing: Build ASP.NET Core APIs with routing, models, validation, middleware, and OpenAPI documentation
• Implement authentication: Implement authentication, authorization, secrets, configuration, and secure data handling
• Integrate databases: Integrate databases, external APIs, messaging, caching, and background processing

Guided Demonstration

1. Review the requirement, users, data, dependencies, permissions, risks, and expected result.
2. Demonstrate the relevant configuration, development, administration, analysis, or collaboration workflow step by step.
3. Capture settings, outputs, logs, screenshots, calculations, test results, and other useful evidence.
4. Compare the observed result with acceptance criteria and explain any corrective action.

Hands-On Activity

Create and secure an integrated ASP.NET Core service.

• Document assumptions, prerequisites, and the planned sequence before starting.
• Complete the activity and preserve evidence of normal, boundary, and failure behavior.
• Record issues, corrective actions, reusable notes, and the next improvement priority.

Scenario Analysis

• Identify the business or technical decision that must be made.
• Compare valid implementation approaches and their trade-offs.
• Consider security, privacy, accessibility, performance, support, and operational impact.

Troubleshooting Focus

• Separate symptoms from causes and collect evidence before applying a fix.
• Check configuration, data, permissions, dependencies, capacity, connectivity, and recent changes.
• Validate rollback, recovery, ownership, user impact, and business continuity.

Validation Checklist

• The requirement, scope, inputs, and expected outcome are clear.
• The selected design or configuration is documented and follows approved standards.
• Normal, boundary, failure, security, accessibility, and operational conditions are reviewed.
• The result is supported by evidence and the next improvement is prioritized.

Lesson Outcome

Learners can explain and apply Web APIs, Security, and Integration in a realistic scenario and validate the result with documented evidence.