Modernizing a Legacy .NET App with GitHub Copilot

Join us for another episode of Sip & Sync with Azure ☕🎤 as we explore how to modernize a legacy .NET application using GitHub Copilot and Azure app modernization tools. In this episode, host Priyanka Vergadia is joined by Krystal Folkes, who walks through an end-to-end modernization journey. Starting with a real-world ASP.NET Web Forms application, Krystal demonstrates how GitHub Copilot agents, planning mode, and security assessments can help teams upgrade legacy code, migrate databases, modernize architecture, and deploy to Kubernetes. This session covers not just code upgrades, but also security baselining, database migration, architecture visualization, and deployment planning. Whether you're dealing with brownfield applications or planning modernization at scale, this walkthrough shows how Copilot can dramatically reduce complexity and time-to-value. What You’ll Learn - How to assess and modernize legacy .NET Framework applications - Using GitHub Copilot plan mode for complex modernization workflows - Performing security baselines before and during modernization - Migrating from SQL Server to PostgreSQL as part of app modernization - Visualizing architecture changes with diagrams and assessments - Moving from monoliths to containers and Kubernetes deployments - Customizing modernization workflows for different teams and phases 00:00 – Welcome to Sip & Sync with Azure 00:10 – Modernizing .NET Apps with GitHub Copilot 00:17 – Introducing Krystal Folkes 00:42 – Legacy App Overview and Modernization Goals 01:32 – Challenges with Legacy .NET and SQL Stored Procedures 02:12 – Planning App Modernization with Copilot Plan Mode 03:36 – Copilot Agents, Skills, and Modernization Workflow 04:30 – Legacy Assessment and Security Baseline 05:13 – Creating a Modernization and Migration Plan 06:24 – Running the One-Prompt Modernization Agent 07:20 – Reviewing Assessments and Architecture Insights 08:34 – Security Findings and Vulnerability Analysis 09:05 – Package Migration