Convert Your Access Database to a .NET Application—ASP.NET, SQL Backend, VBA to C#
We migrate Access data to SQL Server or Azure SQL and rebuild forms and VBA as an ASP.NET application — browser-based, multi-user, no Access Runtime required.
Serving businesses across the United States
Quick Answer
Converting Access to .NET means moving tables to SQL Server or Azure SQL, rebuilding screens in ASP.NET, and rewriting VBA as C# or VB.NET services. Typical departmental rebuilds take 6–16+ weeks with staging validation before cutover.
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Also called: convert Access database to .NET application, migrate Access to ASP.NET, Access VBA to .NET, or move Access to a C# web app. Same rebuild — this page covers it fully.
Typical timeline
6–16+ weeks
Typical rebuild cost
$15,000–$75,000
Typical concurrent users
Hundreds (host-sized)
Get a Free Access-to-.NET Assessment
Tell us form count, VBA complexity, and preferred ASP.NET style (Razor, Blazor, API). We reply with a rebuild plan and quote.
Signs You Should Convert Access to .NET
If you mainly need a stronger engine, upsize to SQL first. Choose .NET when the application layer must leave Access.
Convert Access to ASP.NET Without a Fake Auto-Converter
Schema export is hours. Rebuilding forms and VBA is the project. We scope data migration and application rebuild as clear bands so “Access to .NET” does not hide a UI rewrite inside an ETL quote.
Prefer low-code Microsoft 365? See Access to Power Apps migration. Prefer SQL-only relief first? See Access to SQL Server migration or Azure SQL migration.
Pricing across destinations is on Access database migration cost.
Our 4-Phase Access to .NET Conversion Process
Access Application Assessment
We inventory tables, forms, reports, macros, and VBA. You get an MVP screen backlog, report strategy, and a recommendation for Razor Pages, MVC, Blazor, or API + SPA — before scaffolding starts.
SQL Model & .NET Architecture
We design SQL Server/Azure SQL schema, auth (including Entra ID when needed), and service boundaries for VBA ports. Field mapping covers AutoNumber, attachments, and Access-only types.
Build, Migrate, Stage
We build the ASP.NET app against staging data while Access stays live. Parallel checks cover counts, critical workflows, and permissions. Performance baselines catch chatty data access before go-live.
UAT, Cutover & Handoff
Users accept the new app, we cut over off-hours, and we hand off deploy pipelines, secrets, and ops docs. Support covers the first production week of edge cases.
Microsoft Access vs. .NET Web App: Why Convert
| Factor | Microsoft Access | .NET / ASP.NET + SQL |
|---|---|---|
| Cost | Desktop licenses; hidden ops cost from locks | Higher rebuild cost; Windows/Linux hosting + .NET ownership |
| Scalability | 2 GB file ceiling; weak multi-writer behavior | Scales with SQL and app servers you size |
| Licensing | Access / Microsoft 365 | No Access Runtime for end users; SQL/Azure as needed |
| Concurrent users | Roughly 10–25 practical concurrent editors | Hundreds with proper hosting and pooling |
| Hosting | File share / VPN | IIS, Azure App Service, containers, etc. |
| UI | Desktop Access forms | Browser ASP.NET / Blazor / SPA UI |
| VBA / logic | Form events and modules in the .accdb | Testable C# / VB.NET services and SQL |
Also considering an open-source stack like Node/JavaScript or Python? Same rebuild process — tell us your preferred stack in the assessment and we'll scope it accordingly.
Who We Convert Access Databases to .NET For
Our clients are US-based IT and ops teams standardizing on Microsoft application stacks. Typical work overlaps the industries we cover under industry solutions.
- Finance teams replacing Access trackers with ASP.NET internal tools
- Manufacturers whose IT standard is SQL Server + .NET
- Professional services firms that need SSO and browser access
- Internal IT groups retiring Access Runtime from the desktop image
Access to .NET Migration: Frequently Asked Questions
How do I convert an Access database to a .NET application?
You move tables to SQL Server (or Azure SQL), rebuild UI in ASP.NET (MVC, Razor Pages, Blazor, or API + SPA), and rewrite VBA as C# / VB.NET services. There is no mechanical Access-to-.NET form converter — this is a software rebuild with a data migration underneath.
Can I move Access VBA to .NET myself?
You can migrate tables to SQL Server with SSMA and keep Access forms briefly, but VBA does not compile into C# or VB.NET automatically. Every form event and business rule still needs a deliberate port. DIY “converters” that only export schema leave you without an application — hire for the rebuild once VBA is more than trivial.
Migrate Access to ASP.NET vs keep Access forms on SQL Server?
Keep linked Access forms when you need fast relief from corruption and locks. Choose ASP.NET when browser access, modern auth, and no Access Runtime are requirements. Many teams do SQL first, ASP.NET second — see Access to SQL Server migration for phase one.
How long does an Access to .NET migration take?
Departmental rebuilds typically take 6–16+ weeks depending on form count, VBA density, integrations, and UAT. Thin CRUD apps land earlier; line-of-business systems with heavy macros take longer.
How much does it cost to convert Access to .NET?
Full rebuild services commonly fall in the $15,000–$75,000 range at $90/hour with a fixed-scope quote after assessment. Upper end rises with SSO, complex reporting, and multi-system integrations. Backend-only SQL upsizing is far cheaper if the UI can wait.
Will I lose data converting Access to .NET?
No. We migrate into staging SQL, validate counts and relationships, keep Access live during build, and cut over after critical workflows pass in the new app. Attachments get an explicit file-storage design.
What happens to Access VBA in a .NET migration?
VBA becomes C# or VB.NET: domain services, stored procedures, background workers, and UI event handlers. We inventory every module and map each procedure so business rules are not left in a retired .accdb.
How many concurrent users can a .NET app support vs Access?
Access tops out around 10–25 practical concurrent editors. ASP.NET on SQL Server routinely supports hundreds of concurrent users when sized correctly — limited by hosting and query design, not a file database.
Should I choose Power Apps instead of ASP.NET?
Power Apps is faster for Microsoft 365 low-code internal tools. ASP.NET wins when you need full code control, custom UX, or IT standards that prefer .NET over Power Platform licensing. We compare total cost in the assessment.
Can we keep Access running while building the .NET app?
Yes. SQL upsizing plus linked Access is a common bridge while ASP.NET modules replace screens. Pure file Access without a server backend is a weaker bridge under concurrent load.
Do Access reports become ASP.NET pages?
Interactive grids can; printable packs more often become SSRS, PDF libraries, or Power BI. We catalog reports and assign outputs so operations still get month-end documents on go-live.
Got a problem we can help with?
Book a free 30-minute call. Tell us what you're dealing with and we'll tell you how we'd approach it.