.NET WebForms Migration
Replace deprecated .NET WebForms
with modern TypeScript
.NET WebForms was deprecated by Microsoft in 2019. ViewState bloat, postback architecture, and code-behind files make these applications impossible to maintain with modern tooling. DEX parses the ASPX pages, extracts the business logic, and generates a clean TypeScript application.
The Process
20-100x faster than manual development.
More accurate because it's governed.
Every step uses the same engine: AI that works inside a structured framework, not a blank canvas. The output is auditable, testable, and yours to own.
AI documents your entire codebase
The engine parses every source file — ASPX pages, code-behind (.cs/.vb), ViewState, master pages, user controls — and produces a structured inventory. Every event handler, every validation rule, every dependency chain is catalogued before any transformation begins.
- Full ASPX + code-behind parsing with dependency mapping
- Business rule extraction into structured JSON descriptors
- Complexity scoring per page (event handlers, ViewState, controls)
- Automated documentation generation
Review the business logic — add improvements
Every extracted rule is presented in a structured review interface. Your team walks through each page, confirms the logic, flags scope changes, and adds improvements — before any code is generated. This is where you eliminate ViewState debt and postback spaghetti.
- Visual business rule inspector — no code-behind reading required
- Side-by-side: legacy logic vs proposed modern equivalent
- Flag rules for removal, modification, or enhancement
- Add new requirements directly into the migration scope
Order amount must be positive on submit
Orders.aspx.cs → btnSubmit_ClickViewState-dependent grid refresh — replace with live data binding
Inventory.aspx.cs → GridView_PageChangedLegacy UpdatePanel partial postback for status refresh
Dashboard.aspx.cs → Timer_TickReal-time WebSocket updates for dashboard metrics
Added during reviewAI generates the modern application
The governed AI engine transforms every reviewed rule into production TypeScript code — REST APIs, JSON descriptor screens, and typed validators. Not free-form generation: every output follows the framework's constrained patterns.
- C# code-behind → TypeScript with semantic equivalence
- ASPX pages → JSON descriptors rendered by the governed runtime
- ViewState + postbacks → modern state management with REST APIs
- 5-10x fewer AI tokens than free-form generators
protected void btnSubmit_Click(
object sender, EventArgs e) {
if (txtAmount.Text == "" ||
decimal.Parse(txtAmount.Text)
<= 0) {
lblError.Text =
"Amount must be positive";
return;
}
}const amount = parseDecimal(
form.amount
);
if (!amount || amount <= 0) {
return {
ok: false,
code: 'AMOUNT_NOT_POSITIVE'
};
}Automated testing and live preview
Every generated screen has unit tests derived from the original business rules. A live preview lets your team inspect each screen's layout, logic, and data flow before deployment.
- Unit tests auto-generated from every business rule
- Visual regression testing against legacy screenshots
- Live preview with JSON descriptor inspector
- Side-by-side: legacy screen vs modern screen
Keep building with the AI builder
Migration is day one. The same engine that migrated your WebForms application becomes your tool for building new features, screens, and integrations. A DEX Architect uses the governed AI builder to ship 5-15 new screens per month.
- Same framework, same JSON descriptors, same governance
- Natural language → production screen in 2-4 hours
- Add integrations (ERP, CRM, APIs) without rebuilding
- Every new feature is immediately testable and auditable
Why 20-100x faster?
Manual development regenerates architecture decisions on every feature. The DEX engine generates against a fixed framework with reusable patterns. The AI doesn't think about folder structure, auth, logging, or deployment — it's all built in.
Manual development per screen
DEX AI builder per screen
Manual full migration
DEX full migration
More accurate because every rule has a unit test. More auditable because every screen has a JSON descriptor. More maintainable because the output is standard TypeScript.
Ready to see the process on your WebForms application?
Send us 3-5 ASPX pages with code-behind files. We'll run the analysis, show you the business rules we extracted, and deliver a scoped migration plan within 5 business days.