Dot NET with C# and ASP.NET API Development — Lesson 3: Data Access, Authentication, Validation and Error Handling

Learning Objectives

• Explain and apply data access, authentication, validation and error handling within a practical Dot NET with C# and ASP.NET API Development scenario
• Validate data access, authentication, validation and error handling using documented requirements, configuration evidence, quality checks, risks, and measurable outcomes

Detailed Topics

• Explain and apply data access, authentication, validation and error handling: Explain and apply data access, authentication, validation and error handling within a practical Dot NET with C# and ASP.NET API Development scenario
• Validate data access, authentication, validation and error handling using documented requirements, configuration evidence, quality checks, risks, and measurable outcomes: Validate data access, authentication, validation and error handling using documented requirements, configuration evidence, quality checks, risks, and measurable outcomes

Guided Demonstration

1. Review the requirement, users, data, dependencies, permissions, risks, and expected result.
2. Demonstrate the relevant configuration, development, analysis, administration, testing, or operational 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

Analyze a realistic business case, compare implementation options, and validate the selected approach.

• 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 Data Access, Authentication, Validation and Error Handling in a realistic scenario and validate the result with documented evidence.