Legacy .NET, modernised

.NET Framework to .NET 8 Migration

Move .NET Framework 4.x applications to modern .NET step by step — faster, cross-platform and supported again.

Book a Free Call
Framework to current LTS
4.x → 10
Big-bang rewrites
0
Docker and Azure ready
Linux

Service Overview

I migrate .NET Framework 4.x applications to modern .NET — .NET 8 or the current LTS, .NET 10 — without a risky big-bang rewrite. The work starts with an assessment of your solution and dependencies, then moves project by project: class libraries first, then ASP.NET MVC and Web API to ASP.NET Core, Entity Framework 6 to EF Core, and WCF services to gRPC, REST or CoreWCF. Tests are added before code moves, so behaviour stays the same while your app becomes faster, container-ready and able to run on Linux.

Large applications are migrated incrementally rather than all at once. Shared libraries are retargeted (often to .NET Standard 2.0 first so both old and new apps can use them), the .NET Upgrade Assistant and analyzers flag incompatible APIs, and replacements are chosen for each blocker — System.Web, WCF server, AppDomains, Web Forms. For web apps, a YARP reverse proxy can route some URLs to the new ASP.NET Core app while the rest still run on the old one, so features move over gradually with no downtime. Note that .NET 8 support ends in November 2026, so new migrations should usually target .NET 10, which is supported until November 2028.

What's Included

  • Assessment of projects, NuGet dependencies and blockers
  • ASP.NET MVC and Web API to ASP.NET Core
  • Entity Framework 6 to EF Core
  • WCF to gRPC, REST APIs or CoreWCF
  • WinForms and WPF to modern .NET desktop
  • Incremental migration with YARP — no big-bang rewrite

Technologies Used

.NETASP.NET CoreEntity FrameworkC#SQL ServerAzure

How I Deliver

  1. Assessment

    Inventory projects, NuGet packages and Windows-only APIs, and produce a migration plan with effort per project.

  2. Safety net

    Add characterisation tests around critical behaviour so every step can be verified.

  3. Shared libraries first

    Retarget class libraries (often to .NET Standard 2.0) so old and new apps can share them during the move.

  4. Migrate the apps

    Move web, API, data and service layers project by project, replacing blockers like System.Web and WCF.

  5. Cut over and optimise

    Switch traffic to the new app, retire the old code, and set up CI/CD and container or Azure hosting.

Why It Matters

Supported again

Modern .NET gets new features and security updates; .NET Framework 4.8 only receives fixes.

Faster and cheaper to run

ASP.NET Core and the modern runtime handle more requests on the same hardware.

Run anywhere

Linux, Docker and Azure App Service hosting instead of Windows Server and IIS only.

Easier hiring

Developers want to work on modern .NET; a current stack is easier to staff and maintain.

What You Get

  • Migration assessment and plan with effort per project
  • Application running on .NET 8 or .NET 10
  • Test suite covering critical behaviour
  • Updated CI/CD pipeline and hosting setup
  • Notes on every API replacement and breaking change

Who It's For

  • Companies running ASP.NET MVC or Web API apps on .NET Framework 4.x
  • Teams blocked by Windows-only hosting or IIS
  • Products that need to move to containers or Linux
  • Businesses whose legacy .NET app is hard to staff or extend
Contact Me Book a Call
.NET Framework to .NET 8 Migration — Muhammad Rehman Tahir
Core ServiceAvailable

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Have Questions?

Happy to answer any questions before you commit.

Ask a Question

Why migrate off .NET Framework

.NET Framework 4.8 still runs, but it no longer gets new features, only runs on Windows, and gets harder to staff every year.

Faster runtime

ASP.NET Core and the modern JIT serve more requests with the same servers.

Supported LTS

.NET 10 is supported until November 2028.

Cloud and containers

Run on Linux, Docker, Kubernetes or Azure App Service.

Step by step

Incremental migration keeps the app live while features move over.

Tests first

Characterisation tests prove the migrated code behaves exactly like the old code.

.NET Framework 4.8 vs modern .NET

.NET Framework 4.8.NET 8 / .NET 10
PlatformsWindows onlyWindows, Linux, macOS, containers
New featuresNone — fixes onlyYearly releases with new features
Web frameworkASP.NET MVC / Web Forms on IISASP.NET Core on Kestrel, IIS or containers
PerformanceOlder runtimeMuch faster runtime and web stack
Hosting costWindows Server licencesLinux hosting and containers available
FAQ

.NET Framework to .NET 8 Migration — FAQs

For most new migrations, .NET 10. .NET 8 is a long-term-support release whose support ends in November 2026, while .NET 10 is the current long-term-support release, supported until November 2028. Code moved to .NET 8 upgrades to .NET 10 with little effort.
A small API or library can move in days; a large web application with several projects usually takes weeks to a few months. The assessment at the start gives an estimate for each project before any code is changed.
Yes. Shared libraries are retargeted first, and for web apps a YARP reverse proxy can send some routes to the new ASP.NET Core app while the rest stay on the old one. Features move over one by one with no downtime.
Web Forms is not available in modern .NET, so those pages are rebuilt — usually as Razor Pages, MVC or Blazor — while the business logic behind them is reused where possible.
Yes. Depending on the clients that call them, WCF services move to gRPC, REST APIs in ASP.NET Core, or CoreWCF, which keeps most of the existing service contracts.
Yes, once Windows-only dependencies are replaced. Most migrated web apps and APIs can then run in Linux containers or on Azure App Service for Linux.
What I Do

My Services

End-to-end software solutions tailored to your business needs.

  • Custom NuGet Package Development

    Custom NuGet Package Development

    Turn duplicated .NET code into versioned, documented NuGet packages — published to nuget.org or your private feed.

    C#.NETNuGetGitHub ActionsAzure DevOpsxUnit
    Details
  • Hire a Remote .NET Developer

    Hire a Remote .NET Developer

    A dedicated ASP.NET Core developer who works your hours — hourly, monthly or fixed-scope, with clear weekly reporting.

    C#ASP.NET CoreEntity FrameworkSQL ServerReactAzure
    Details
  • Full-Stack Web Development

    Full-Stack Web Development

    Your complete website or web app — designed, built, launched and supported by one dedicated developer.

    React.jsAngularASP.NET CoreAzureSQL Server
    Details
  • Custom Solution Implementation

    Custom Solution Implementation

    Software built around the way your business actually works — not the other way around.

    C#.NETASP.NET CoreEntity FrameworkSQL ServerAzure
    Details
  • ASP.NET Core Development

    ASP.NET Core Development

    Robust, scalable web applications and APIs using ASP.NET Core with clean architecture principles.

    C#ASP.NET CoreEntity FrameworkSQL ServerAzure
    Details
  • Database Design & Optimization

    Database Design & Optimization

    Efficient, normalized databases with optimized queries for maximum performance and scalability.

    SQL ServerPostgreSQLMySQLSQLiteEntity Framework Core
    Details
  • Payment Gateway Integration

    Payment Gateway Integration

    Secure Stripe, PayPal and custom wallet integrations with reliable checkout and transaction workflows.

    StripePayPalASP.NET CoreC#Webhooks
    Details
  • Desktop Application Development

    Desktop Application Development

    Feature-rich Windows desktop applications using WPF and WinForms with professional UIs.

    WPFWinFormsC#.NETSQL Server
    Details
  • API Integration & Consulting

    API Integration & Consulting

    Third-party API integrations and hands-on consulting for complex system architectures.

    ASP.NET Core Web APIRESTJSONPostmanAzure
    Details
  • Quality Assurance & Testing

    Quality Assurance & Testing

    Comprehensive manual and automated testing to ensure your software is reliable, stable, and bug-free.

    SeleniumCypressxUnitPostmanPlaywright
    Details
  • Complete Web Auditing

    Complete Web Auditing

    Full website audit covering SEO, AEO, overall visibility, UX, performance, and technical health.

    LighthouseGoogle Search ConsoleAnalyticsPageSpeed InsightsSchema.org
    Details
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Beyond My Core

Other Services That I Can Provide

Additional capabilities to support your business beyond core development.

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