GitHub Copilot AI Code Review in Visual Studio 2026
Can GitHub Copilot in Visual Studio 2026 perform a serious AI code review on a real-world .NET project?
In this video, I use GitHub Copilot to analyze and review a legacy .NET application written in 2013, and then compare that review with a completely rewritten modern version of the same project.
The goal is to see how useful *AI-powered code reviews* really are when modernizing legacy software.
But there’s a catch…
Simply asking Copilot to “review the code” often produces **polite, incomplete, and sometimes misleading results**. To get a truly useful review, the AI needs **structure, guidelines, and a scoring framework**.
In this episode, I show how a *custom code review scorecard* dramatically improves the quality of AI feedback.
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⏱️ TIME STAMPS
00:00 – Reviews Are Tricky
02:20 – Simple Un-Guided Review
03:21 – Target Scorecard Approach
05:24 – Detailed Review with Custom Guidelines
06:51 – Reviewing the Updated Codebase
09:17 – Conclusion & Key Takeaways
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🔎 What You’ll Learn in This Video
1️⃣ The Problem with Simple AI Code Reviews
When you ask *GitHub Copilot* to perform a generic review:
Architectural issues may be missed
Team conventions are unknown
AI tends to be overly polite
Code quality scores can become inflated
This can lead to **misleading conclusions about the health of a codebase**.
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2️⃣ Reviewing a Legacy .NET Codebase
The original 2013 project contained several major issues:
Heavy use of *static classes*
Thin pass-through services
*Mixed domain logic and data access*
No meaningful automated tests
*No clear architecture*
Using a structured **AI code review scorecard**, Copilot produced a brutal but honest result:
*15 / 100 — Technical Bankruptcy*
Recommendation:
Do *not attempt incremental fixes*
Perform a *complete rewrite*
Use the old system as reference only
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3️⃣ Structured AI Code Reviews with Scorecards
To improve the quality of the review, Copilot was given:
A *Markdown scorecard*
*Weighted development categories*
A predefined *solution architecture template*
Clear development standards
Example weighting:
Programming quality – 15%
Testing – 20%
Architecture – heavily weighted
This forces the AI to evaluate the project **in a much more structured way**.
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4️⃣ Reviewing the Modern Rewritten Application
After rewriting the application using modern practices and *GitHub Copilot assistance**, I ran the **same structured review* on the updated codebase.
The result:
Major architectural improvements
Proper project separation
Better maintainability
Refactoring roadmap
Estimated improvement timeline
One interesting observation:
AI reviews are **not deterministic**.
Even when using the same prompt and scorecard, results can vary.
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🎯 Key Takeaways
AI code reviews need *clear guidelines*
Simple prompts often *inflate results*
Scorecards dramatically improve feedback quality
Architecture must be evaluated explicitly
AI tends to avoid being overly critical
Running the same review twice may produce *different outputs*
If you want **serious AI-assisted code reviews using GitHub Copilot in Visual Studio 2026**, you need more than a simple prompt — you need a **review framework**.
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👉 *Watch this video as part of the full series (recommended):*
[ • GitHub Copilot AI Code Review in Visual St... ]( • GitHub Copilot AI Code Review in Visual St... )
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📚 Watch the Full Series
📹 *Episode 1:* GitHub Copilot AI Code Review – Can AI Understand Legacy .NET Code?
[ • GitHub Copilot AI Code Review – Can AI Und... ]( • GitHub Copilot AI Code Review – Can AI Und... )
📹 *Episode 2:* Creating .NET Projects and Solution Structure
[ • GitHub Copilot Visual Studio 2026 | Creati... ]( • GitHub Copilot Visual Studio 2026 | Creati... )
📹 *Episode 3:* Legacy Code Rewrite – Random Number Generator
[ • Refactoring Legacy Code with GitHub Copilo... ]( • Refactoring Legacy Code with GitHub Copilo... )
📹 *Episode 4:* Working Without Agent Skills in Visual Studio 2026
[ • GitHub Copilot in Visual Studio 2026 – Wor... ]( • GitHub Copilot in Visual Studio 2026 – Wor... )
📹 *Episode 5:* Vibe Coding Razor Pages
[ • GitHub Copilot Agent Mode: Vibe Coding ASP... ]( • GitHub Copilot Agent Mode: Vibe Coding ASP... )
➡️ *Episode 6:* Code Review (This Video)
[ • GitHub Copilot AI Code Review in Visual St... ]( • GitHub Copilot AI Code Review in Visual St... )
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💻 GitHub Repository
[https://github.com/mpholoane-bapela/l...](https://github.com/mpholoane-bapela/l...)
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#githubcopilot #aicoding #softwaredevelopment #dotnet
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