Visual Basic (VB6) to .NET Core Migration Automation

This workflow automates the translation of VB6 forms, COM components, and business logic into modern .NET Core services and Blazor or React front-ends. It targets the operational bottleneck of maintaining unsupported, undocumented desktop applications that are costly to secure and integrate. The savings come from eliminating months of manual code analysis and rewrite effort, reducing the risk of logic errors, and enabling a phased, test-driven cutover that protects business continuity during the transformation.

Implementation requires an orchestration layer, like LangGraph, to sequence specialized agents for parsing, mapping state management, and replacing third-party ActiveX controls. The architecture integrates with source control, CI/CD pipelines, and test frameworks to generate and validate the new stack. Critical controls include approval gates for complex logic translation, automated reconciliation of outputs against the legacy system's behavior, and comprehensive observability to track migration progress and flag regressions before production deployment.

This multi-agent pipeline automates the high-risk, labor-intensive translation of VB6 business logic, stateful forms, and COM dependencies into stateless .NET Core APIs and component-based UIs. It directly targets the operational bottleneck of scarce VB6 expertise and manual code analysis, converting months of error-prone work into a controlled, auditable engineering process. The savings come from accelerated migration timelines, reduced testing overhead, and the elimination of manual logic mapping errors that cause post-migration defects and business disruption.

Implementation requires orchestrating specialized agents—parsing, logic extraction, code generation, and validation—within a framework like LangGraph, integrated with source control and CI/CD systems. Critical controls include approval gates for generated service contracts and UI wireframes, exception routing for ambiguous COM interactions, and comprehensive observability to track translation accuracy. The architecture must output not just code, but also integration test suites, infrastructure-as-code templates, and deployment runbooks to support a phased, business-safe rollout that minimizes operational risk.

This blueprint automates the high-risk translation of VB6 forms, COM components, and stateful logic into stateless .NET Core APIs and modern front-ends. The workflow begins with static analysis to inventory modules and map data flows, then uses multi-agent systems to parse business rules, generate service stubs, and create integration test harnesses. This phased approach allows for incremental validation, isolating financial or operational logic for rigorous testing before any legacy system is decommissioned, directly reducing transformation risk and protecting core operations.

Implementation orchestrates agents using LangGraph to manage state across parsing, translation, and validation stages, integrating with source control and CI/CD pipelines. Each generated service undergoes automated unit and integration testing against the original VB6 logic to ensure behavioral parity. The final phase employs canary deployments and traffic routing logic, often built with service mesh controls, to switch user cohorts incrementally. This controlled rollout, backed by real-time reconciliation agents, provides the operational safety net required for enterprise systems where downtime or logic errors carry significant cost.

A governed migration workflow begins with a centralized orchestrator that sequences the translation of VB6 modules based on business criticality and technical dependencies. It pulls source code from version control, triggers automated parsing and translation agents, and routes the generated .NET Core services to a validation pipeline. This initial orchestration layer ensures that migration proceeds in logical, low-risk increments, preventing uncontrolled big-bang cutovers that jeopardize business operations. The sequence is defined in a manifest that maps to the overall program plan.

Each phase requires explicit approval gates—automated security scans, performance benchmarks against legacy SLAs, and stakeholder UAT—before traffic is shifted. The orchestrator integrates with tools like SonarQube for code quality, Azure DevOps for release pipelines, and ServiceNow for change management tickets. Exception handling is critical; any failed validation automatically routes the module to a human review queue with detailed diagnostics. Post-cutover, reconciliation agents run in parallel, comparing transaction outcomes between the legacy and new systems, generating alerts for any data drift, and providing the audit trail required for final decommissioning approval.

This automation directly addresses the high cost and risk of manually rewriting VB6 applications, which are often business-critical but rely on obsolete COM components and stateful UI logic. The workflow parses forms, modules, and class files to extract business rules, map data flows, and generate functionally equivalent .NET Core services with REST APIs. It isolates and modernizes third-party ActiveX controls, translating them into modern Blazor or React components, while preserving complex state management patterns. The result is a phased, testable migration that prevents logic loss and dramatically accelerates the transition off unsupported infrastructure.

Implementation requires orchestrating specialized agents for parsing, translation, and validation, integrated with source control and CI/CD pipelines. The architecture must handle exceptions, such as ambiguous business logic or unsupported COM calls, by routing them to a human review gate with full context. Controls include automated unit test generation from original VB6 paths, performance benchmarking against the legacy runtime, and incremental deployment orchestration to manage cutover risk. The final output is a cloud-ready .NET Core codebase with API contracts, modern front-ends, and a comprehensive test suite, enabling a controlled, business-safe migration.