● Built by the founders of Artinsoft & Mobilize.NET

ASP.NET Web Forms Modernization
That Actually Works at Scale

Pure LLM approaches work on small codebases. For the complex, multi-project enterprise applications that matter most, you need a different strategy — deterministic migration tools combined with AI for validation, testing, and the cases that require semantic understanding.

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20+
Years of legacy
modernization expertise
80–90%
Of migration handled
by deterministic tools
<15%
LLM success rate on repos
over 50,000 lines of code
2
Migration strategies:
functional-equivalent or full
The Reality of AI Migration

Why Pure LLM Migration Fails
Enterprise Codebases

RepoMod-Bench (Li et al., February 2026) — a benchmark study across 21 real-world repositories and 1.6M lines of code — revealed a stark performance cliff that directly determines whether your migration succeeds or fails.

LLM Success Rate by Codebase Size

Under 10,000 lines 90%+

LLMs excel: entire codebase fits in context window

10,000 – 50,000 lines ~45%

Mixed results: partial context, inconsistent output

Over 50,000 lines 15.3%

Frequent hallucination, broken cross-file dependencies

Source: Li et al., RepoMod-Bench (arXiv:2602.22518, Feb 2026) — 21 real-world repositories, 1.6M LOC, 11,616 tests

Why This Happens

The Context Window Is Not Your Problem.
The Architecture Is.

Enterprise Web Forms applications are characterized by deep cross-file dependencies, stateful postback chains, embedded business logic, and years of accumulated coupling. LLMs cannot hold this structure in memory simultaneously.

The result: individually migrated files that don't integrate, broken postback relationships, lost view state semantics, and hallucinated API calls that never existed in the original codebase.

  • Cross-file dependencies broken silently
  • View state and postback relationships lost
  • Inconsistent patterns across migrated files
  • Embedded JavaScript business logic ignored
  • Third-party component replacements guessed, not mapped
  • No validation that behavior is functionally equivalent
Our Approach

Deterministic Tools Do the Heavy Lifting.
AI Handles the Complexity.

We built migration tooling over 20 years — before LLMs existed. That deep deterministic foundation is what makes our AI integration genuinely effective rather than aspirationally marketed.

Deterministic code analysis

Deterministic Analysis

Full static analysis of your solution: every dependency, every postback chain, every data binding, every business rule — parsed deterministically before a single line of code is transformed.

Rule-based code transformation

Rule-Based Transformation

80–90% of your codebase is migrated through proven, battle-tested transformation rules. Predictable output. Verifiable results. No hallucination, no guesswork.

AI semantic validation

AI Semantic Validation

LLMs validate that the migrated code preserves the semantic behavior of the original. Not just syntactic equivalence — functional equivalence at the business logic level.

Automated test generation

Automated Test Generation

AI generates comprehensive test suites from the original application's behavior. Optionally enhanced with execution traces captured from the running original system for ultra-high confidence.

Last-mile AI resolution

Last-Mile AI Resolution

The remaining complex cases — unusual patterns, deeply nested logic, custom control interactions — are handled by AI with full context of the entire migrated solution.

Post-migration API modernization

Post-Migration Modernization

Extract the semantic functionality of your application and expose it as APIs or agent-callable services — making your system ready for modern workflows and integrations.

💡

This is not an either/or choice. Our deterministic tools get you 80–90% of the way there safely and repeatably. AI handles the validation, the testing, and the cases that genuinely benefit from semantic understanding. The result is a migration you can actually trust.

How It Works

A Migration Pipeline
Built for Enterprise Reality

Every step in our process is designed to handle the complexity of real enterprise Web Forms applications — not toy projects.

Detailed Approach →
📊

Deep Codebase Analysis

Full parse of your solution: projects, dependencies, file relationships, patterns, and complexity metrics. No guessing — complete structural understanding.

🗺️

Migration Strategy & Tool Customization

We adapt and configure the migration tooling to your specific patterns, third-party components, and architectural constraints before a single line is transformed.

⚙️

Deterministic Transformation (80–90%)

Rule-based tools migrate the bulk of your codebase. View state handling, postback chains, data bindings, and control hierarchies — all transformed to their modern equivalents.

🧠

AI Semantic Validation & Test Generation

AI validates functional equivalence and generates a comprehensive test suite. Optionally, execution traces from the original system harden the tests further.

🎯

Last-Mile AI Resolution

Complex cases are resolved by AI with full solution context — ensuring consistency across the entire migrated codebase.

🚀

Delivery & Post-Migration Enablement

Your team takes ownership of the migrated application. Optionally, we extract semantic APIs to connect your system to modern workflows.

Technical Depth

We Solve the Hard Problems
Other Tools Skip

Web Forms has architectural patterns that pure LLM migration simply cannot handle correctly. We have deterministic solutions for each.

📋

View State & Postback

We identify every view state interaction, hidden field usage, and postback chain — then map each to the appropriate modern equivalent: state management, AJAX patterns, or server-side session.

Learn how we handle view state →
⚡

Client-Side JavaScript

Web Forms applications often embed business logic in JavaScript — validation, calculations, data manipulation. We parse all of it, identify business logic, and extract it to the right layer in the target architecture.

Learn how we handle JavaScript →
🧩

Third-Party Controls

Telerik, DevExpress, Infragistics, ComponentOne — we identify the exact functionality of each control, map it to an equivalent in the target environment, and create transformation rules for consistent replacement.

Learn how we handle third-party controls →
Migration Strategies

Two Paths. One Goal.
A Working Modern Application.

The right approach depends on your business constraints, risk tolerance, and how much change your users can absorb. Both paths use the same deterministic + AI foundation.

🔄
Lower Risk

Functional-Equivalent Migration

Keep the original UI intact. Extract and modernize the business logic while modifying the original application to call the new extracted services. Systems run side by side during the transition — with no duplication of business logic.

  • Same user interface, no retraining required
  • Business logic gradually extracted and modernized
  • Original system remains operational throughout
  • Lower risk, incremental changeover
  • Better long-term architecture
Learn More →
⚡
Full Replacement

Full Platform Migration

Complete migration to modern .NET and a contemporary UI framework. Faster to a fully modern architecture, but requires acceptance of platform-driven differences in some functionality.

  • Complete modernization in one program
  • Modern UI framework from day one
  • Faster path to full architectural independence
  • Some UI/UX adjustments due to platform differences
  • Higher initial change management effort
Learn More →
Beyond Migration

Make Your Application
Ready for Modern Workflows

Migration is the floor, not the ceiling. Once your application runs on modern .NET, we can extract the semantic functionality and expose it in ways that were impossible with Web Forms.

Using AI to understand what your application does — not just what it is — we generate APIs and agent-callable interfaces that make your business logic available to modern systems, automation platforms, and AI-powered workflows.

  • AI extracts semantic understanding of business functions
  • Business logic exposed as clean REST or gRPC APIs
  • Agent-callable interfaces for AI workflow integration
  • External system integration without rebuilding core logic
  • Your team owns the result — no vendor lock-in

From Legacy Monolith to API-First

ExtractedBusinessService.cs
// AI-extracted from OrderProcessing.aspx.cs [ApiController] [Route("api/orders")] public class OrderService : ControllerBase { [HttpPost("submit")] public async Task<OrderResult> SubmitOrder(OrderRequest request) { // Same validated business logic. // Now callable by agents, APIs, and apps. return await _processor .ProcessAsync(request); } }

Business logic that lived inside a .aspx.cs codebehind file becomes a clean, independently deployable API — while the original logic remains unchanged and validated.

Who We Are

The Pioneers of Legacy Modernization,
Now with AI

Our team has spent over 20 years building the tools and methodologies that defined enterprise legacy modernization. We didn't pivot to AI — we integrated it where it genuinely improves on what deterministic tools do best.

A
Artinsoft
Legacy Migration Platform

Founded by our team, Artinsoft became the industry reference for automated legacy code migration — migrating Visual Basic 6, PowerBuilder, and early .NET applications for Fortune 500 clients worldwide. The core tool engineering expertise that made Artinsoft successful is the foundation of our approach today.

M
Mobilize.NET
Modern Migration Platform

The evolution of that work — Mobilize.NET brought automated migration to the modern .NET era, handling ASP.NET Web Forms, VB.NET, and complex multi-tier .NET applications at enterprise scale. The experience of hundreds of real migration engagements lives in our tooling.

🎯

20+ years of migration experience means we've seen every failure mode. We know exactly where pure automation breaks down, where manual work is unavoidable, and where AI creates genuine leverage — because we've done this at scale, before AI, and we know what "done" actually looks like for enterprise applications.

Start Here

Ready to Assess Your
Web Forms Application?

We start with a detailed analysis of your codebase — complexity, patterns, third-party dependencies, and risk areas — then recommend the right migration strategy for your situation.

Get a Free Assessment How We Work →