Design Patterns in .NET for End User — Lesson 1: .NET Design Quality, SOLID Principles, and Pattern Selection

Topics Covered

• Explain pattern intent, context, trade-offs, and the difference between patterns and frameworks
• Recognize coupling, cohesion, responsibility, dependency, and maintainability problems
• Apply SOLID principles and refactoring techniques before selecting a pattern
• Course objectives, terminology, environment, roles, and realistic use cases
• Prerequisites, dependencies, assumptions, and expected business outcomes
• Baseline setup, safe working practices, and initial validation evidence

Guided Practice Steps

1. Translate the lesson requirement into a clear Design Patterns in .NET for End User implementation or analysis objective.
2. Document assumptions, selected tools or features, dependencies, risks, and expected results.
3. Perform the guided task, capture evidence, and compare the result with the acceptance criteria.
4. Record issues, corrective actions, and a reusable operational or development note.

Practical Activity

Review a tightly coupled design and identify responsibilities, risks, and suitable refactoring goals.

• Define the scenario, inputs, constraints, and expected outcome.
• Complete the activity and preserve screenshots, outputs, logs, code, or decision evidence.
• Review the result, identify gaps, and document corrective or improvement actions.

Validation Checklist

• The stated requirement and expected outcome are clear.
• Configuration, code, data, or design decisions are documented.
• Normal, boundary, failure, security, and operational considerations are reviewed.
• Evidence supports the conclusion and the next action is prioritized.

Lesson Outcome

Learners can explain and apply .NET Design Quality, SOLID Principles, and Pattern Selection within a realistic Design Patterns in .NET for End User scenario and support the result with validation evidence.