.NET Framework to .NET 8

Do not move your .NET Framework apps to .NET Core because it stopped getting updates in 2022. Go straight to .NET 8 or to .NET 10 (a long-term support version that will be released in November 2025). .NET 8 replaces .NET Core and covers everything .NET Core did, plus more. Microsoft now calls .NET 8 just ".NET," but the web framework is still ASP.NET Core (newer version). If you have old ASP.NET Framework web apps, you need to move them to ASP.NET Core on .NET 8. You can break this migration into two steps. First, move your shared code to the new .NET runtime. Then, move your web app from ASP.NET Framework to ASP.NET Core.

Moving from .NET Framework to .NET 8 is not an upgrade. It's basically building from scratch. The new .NET works on different systems and in the cloud. Everything that uses only Windows will stop working. This includes registry work, event logs, and other things. You need to replace all of it.

Web applications are the hardest to move. Going from ASP.NET to ASP.NET Core requires redesigning your app. WebForms don't work at all in the new system. You need to pick a new way to build your app instead of just updating what you have.

Even simple console programs and code libraries need changes to how they work and get deployed.

Why Migrate .NET Framework to .NET 8?

Porting old .NET Framework to the .NET 8 gives you several business benefits. Your apps work faster. You can run them on Windows, Mac, or Linux instead of just Windows. Security is better too: Microsoft uses stronger protection against attacks and uses better encryption. The code is easier to work with. It’s more modular, so your apps can be lighter and scale better.

Performance and Scalability

.NET 8 is a new way to run apps that works much faster than the old .NET Framework. With over 500 performance improvements, your website or program responds faster even when more clients or staff use it. It doesn't freeze. Your servers don't work as hard, so you spend less money.

• .NET 8 is smarter about turning your code into things the computer can do with Just-In-Time compiler and runtime optimizations. Cases show CPU usage reductions of up to 50%.
• It cleans up memory better.
• And it only loads the parts of your program that you actually need instead of everything compared to monolithic .NET Framework.

Infrastructure Cost Reduction

Move your apps off old .NET Framework and you can save thousands per server every year. Old .NET only runs on Windows servers and costs a lot. New .NET runs on cheap Linux servers. Microsoft just raised Windows prices another 10-20% this year. You don't pay any of that when you switch to Linux.

• Your servers work better. Apps built with new .NET use less CPU power and memory than old .NET Framework apps. You can run more apps on the same server or do the same work as earlier with fewer servers.
• Containers are smaller. New .NET apps fit into smaller Docker containers. Smaller containers cost less to store. You also pay less for bandwidth because the files are smaller.  They deploy faster too.
• Better cloud setup. New .NET works well with cloud services that only create auto-scaling server instances when you need them. When more people visit your site, new servers start up faster. You pay for what you actually use instead of keeping Windows servers running all the time.
• Less maintenance work. Moving to new .NET gets rid of old code problems that slow you down.

Cross-Platform Deployment

Reach customers no matter what operation system they use. You don't need separate engineers for each one.

• The same code runs on Windows, Linux, and Mac. You write it once and it works everywhere.
• Works better with cloud tools. You can put your apps in Docker containers and manage them with Kubernetes. Once they're in containers, they can run on any cloud provider. You can scale them up or down automatically. Want to test a new version with just some users? Or switch between versions instantly? Now you can. Each service runs in its own container with everything it needs, so there are no conflicts between services. Updates are easy. If something goes wrong, you can roll back right away.

Cloud and Modern DevOps

When you migrate to .NET 8, your apps work better with the cloud and make it easier to deploy software. This saves money on servers and gets your software to customers faster.

Old .NET Framework still gets updates on Windows, but it only runs on Windows servers. It's also hard to deploy because you can't easily use new cloud tools or automated systems.

.NET 8 works differently. It runs on any platform and works well with containers. Your team builds the app once, puts it in a container, and can run that same container image anywhere. It works the same way on different cloud providers. You don't need to set up different environments for each one.

With containerized microservices, each part of your app can be scaled separately. When lots of people use one feature, you launch more containers for that feature. When fewer people use it, you remove them automatically. This is better than the old way where you had to add resources to the whole app even if only one part needed more capacity.

Platform-as-a-Service lets you write code once and run it anywhere - different cloud companies, different operating systems. You use the same pieces of code everywhere. The best part is that the cloud company handles the boring stuff like keeping servers running and their scaling, security updates, and maintenance. Your developers can spend time building features instead of managing servers.

Enhanced Security and Compliance

.NET 8 has built-in security that's stronger than what .NET Framework offered, which helps protect against cyber attacks. When you move from old .NET Framework, you get better encryption and modern ways to manage user logins. You get security tools that help meet regulations and compliance rules. But your developers still have to configure the security features the right way.

ASP.NET Core Data Protection helps web applications protect sensitive data with encryption and automated key management. It was built to solve problems with the older Windows DPAPI, which worked only on Windows and was not suitable for web or cross-platform use. Data Protection is now the standard for securing authentication tokens, cookies, etc. in ASP.NET Core apps.

ASP.NET Core and .NET 8 come with built-in security tools to help you meet GDPR, HIPAA, and PCI-DSS requirements.

.NET Framework to ASP.NET Core/.NET 8-10 Migration Process

Migration Readiness Assessment

A migration readiness assessment starts with a detailed audit of your current applications, looking at each component to see whether it can move to the new environment with minimal changes or will need significant redevelopment.

Evaluate the underlying technology stack to identify dependencies, compatibility issues and potential bottlenecks before they become costly problems.

Then, perform a business impact analysis that measures the risk of downtime, outlines the resources — both people and infrastructure — required for each phase, and models the expected return on investment.

By combining these technical and financial insights, leadership receives a clear, data-driven picture of when to execute the migration and how to allocate budget and staff to keep the project on schedule and under control.

• Application Inventory Analysis. An application inventory analysis begins by cataloging every software application in use — then documenting how each one interacts with others across your infrastructure. This detailed mapping uncovers dependencies and data flows so you can see, for example, when updating or retiring a single component what downstream systems might be impacted.
• Risk Impact Modeling. As part of the migration planning, build comprehensive risk-impact models that simulate how the transition might affect core operations. These models outline specific scenarios — such as planned service downtime windows, temporary interruptions in user access and potential delays in data processing — and quantify the effects each could have on revenue, customer satisfaction and internal workflows.

Resource Planning Framework

For a successful migration to .NET Core, you will need to staff each phase with the right mix of capabilities and allow sufficient time for both execution and up-skilling.

In the initial Assessment & Planning phase, a small team can catalog your existing landscape, identify dependencies and establish the target architecture. These professionals will also map out detailed workstreams, risk registers and environment requirements.

Once planning is complete, the Pilot Migration phase should be resourced too. During this phase, the team will convert one or two representative services or modules, validate build and deployment pipelines, and prove feasibility against real-world traffic.

For the Full Migration, staffing must scale, supported by ongoing code reviews. This core team will execute the bulk of the code refactoring, performance tuning and environment provisioning across all remaining services. If your current headcount cannot absorb this load without jeopardizing other projects, plan to hire additional mid-level developers and infrastructure engineers for the duration.

Finally, the Stabilization & Handover phase requires a lean team to resolve residual defects, optimize performance in production and finalize runbooks and operational documentation.

Code Compatibility Assessment

Code Compatibility Scanning

In the Code Compatibility Scanning phase, you'll engage a small, focused team to run an automated assessment across your entire codebase. They'll use the .NET Portability Analyzer to pinpoint every API, NuGet package and Windows-specific call that won't translate to ASP.NET Core/.NET 8-10. As the tool processes each project, it generates a machine-readable report that flags incompatible methods, identifies missing dependencies and lists legacy components or P/Invokes that require replacement or wrapping. Your team then reviews and classifies these findings by effort and business impact, producing a prioritized remediation backlog.

Migration Tool Accuracy Assessment

In the Migration Tool Accuracy Assessment phase, a compact team works to validate the automated compatibility findings. First, each flagged issue from the Portability Analyzer is reproduced in a controlled sandbox environment. The developers execute small proof-of-concepts or unit tests against the proposed replacements or wrappers, confirming that the suggested API swaps actually compile and behave as expected on ASP.NET Core and .NET/.NET 8-10.

The QA engineer builds targeted test cases in isolated sandboxes to confirm that each proposed API swap compiles and behaves correctly, while also uncovering any hidden dependency chains the tool missed. Every discrepancy — whether a true incompatibility or a false positive — is logged with a clear pass/fail result and a concise technical rationale.

By the end of this work, you hold a definitive compatibility matrix that lists exactly which code sections must be refactored, upgraded, or replaced, all vetted by human expertise so that your bulk migration proceeds efficiently and without wasted effort.

Dependency & Framework Analysis

Dependency Resolution

In the Dependency Resolution phase, you'll bring together a lean expert team. They begin by inventorying every third-party library, NuGet package and in-house component your applications depend on, then cross-reference each against the ASP.NET Core and .NET/.NET 8-10 ecosystem. Where an updated version exists, they validate compatibility - where it doesn't, they research and prototype alternative open-source or commercial libraries, or plan custom replacements.

Because .NET Core's runtime and hosting model differ fundamentally from legacy frameworks, your architect leads several design workshops to reshape any components that can't be "lifted" directly. The developers build small proof-of-concepts — replacing a Windows-only data-access module with a cross-platform ORM, for example — to confirm feasibility. After this phase, you have a detailed dependency map that not only flags gaps but provides vetted solutions or redesign blueprints, ensuring that the full migration can proceed without hidden blockers or last-minute surprises.

Package Dependency Mapping

In the Package Dependency Mapping phase, a small cross-functional team runs automated discovery tools and manual reviews to catalog every NuGet package, COM component and external library your applications use.

Third-Party Library Assessment

In the Third-Party Library Assessment phase, a lean team systematically reviews every external component your applications consume. They begin by inventorying all licensed and open-source libraries, SDKs and vendor modules, then engage directly with each supplier to verify whether a fully supported ASP.NET Core and .NET/.NET 8-10 version exists or is on the vendor's roadmap. Where native support is absent, the team researches equivalent offerings in the community and commercial marketplaces, assembles a shortlist of candidates, and builds lightweight proof-of-concept integrations to validate functionality, performance and licensing terms.

API Compatibility Analysis

In the API Compatibility Analysis phase, a tight-knit group conducts a deep dive into every call your code makes against Windows services, system libraries and third-party APIs. They start by extracting all P/Invoke declarations, COM interop calls and use of Windows-only namespaces (such as System.ServiceProcess, System.DirectoryServices, or direct Win32 calls) from your codebase.

For each API or system call, the team evaluates whether a cross-platform equivalent exists in ASP.NET Core and .NET/.NET 8-10 (for example, replacing ServiceController with a Docker or systemd wrapper library, or trading DirectoryServices for a platform-independent LDAP client). Where no direct alternative exists, they prototype thin adapter layers — wrapping native calls in a managed, conditional-compile shim — or redesign the interaction entirely (such as moving from MSMQ to a cloud-agnostic message broker).

Framework Feature Assessment

In the Framework Feature Assessment phase, a small cross-disciplinary team inventorizes every use of legacy .NET Framework technologies — Web Forms pages, WCF service endpoints and Windows Workflow Foundation workflows — and maps each to a modern ASP.NET Core and .NET/.NET 8-10 approach. They review your existing UI layer and identify Web Forms pages whose event-driven model must be reimagined in MVC or Razor Pages. Concurrently, they analyze each WCF contract, determine whether it should become a RESTful Web API or a gRPC service, and draft interface definitions accordingly.

Meanwhile, an integration specialist and the UX lead catalogue every workflow definition built on Workflow Foundation, assessing which processes belong in a microservices-oriented orchestration engine versus a simple background job or function. For each identified feature, the team produces a lightweight design sketch — view model and controller for Web Forms replacements, API surface and serialization format for services, workflow diagram and hosting strategy for background processes — along with high-level effort estimates.

Architectural Modernization Strategy

During the Architectural Modernization Planning phase, a solution architect, senior developers and a DevOps specialist review your application's existing structure. They pinpoint tightly coupled components and introduce a dependency-injection framework so services no longer depend directly on one another.

Configuration settings are moved out of code and into centralized, environment-agnostic providers that load different values for development, testing and production.

In parallel, the team breaks up your monolithic assemblies into smaller, domain-aligned modules, builds proof-of-concept libraries to validate each boundary and establishes a consistent folder structure for reuse and test coverage.

Finally, they deliver CI/CD pipeline templates that bake in these modular patterns, ensuring every future service or feature automatically follows the new architecture.

Cross-Platform Deployment Capabilities

Operating System Independence

A solution architect teams up with infrastructure engineers and a cloud specialist to verify that every application can run unmodified on Linux hosts, Windows containers or in hybrid cloud environments. They begin by refactoring any OS-specific code — file paths, environment-variable access and native libraries — so that all configuration and dependencies are loaded dynamically at runtime. Next, the team builds and tests container images on both Linux and Windows platforms, exercises end-to-end deployment pipelines against AWS, Azure and on-prem Kubernetes clusters, and validates performance and behavior in each environment.

They automate multi-platform CI/CD workflows to guarantee that every build produces artifacts compatible across operating systems.

Finally, they produce a set of environment-agnostic deployment templates and detailed runbooks, and train your operations staff in cross-platform monitoring, incident response and provider-agnostic scaling.

At the end, your applications are fully decoupled from Microsoft-only infrastructure, giving you the freedom to choose hosting based on cost, performance or geography without any code changes.

Multi-Cloud Deployment Strategy

During the Multi-Cloud Deployment Strategy phase, a cloud architect works alongside infrastructure engineers and a security specialist to design and validate deployments across multiple providers and on-premises environments.

They start by cataloging each application's infrastructure requirements — compute, storage, networking and security — and mapping those to equivalent services in AWS, Azure, Google Cloud and your private data center. Next, the team develops reusable infrastructure-as-code modules (for example, Terraform or ARM templates) that can provision identical resources in each target environment, ensuring consistent configuration and reducing drift.

In parallel, they build CI/CD pipelines that detect the target platform — cloud or on-prem — and deploy the correct artifacts and settings automatically. To meet data residency and compliance needs, they establish region-specific storage buckets and network isolation, then run failover drills that replicate production traffic between providers. The security specialist sets up unified identity and access controls — using federated identity and policy-as-code — so that permissions remain consistent regardless of hosting location.

Throughout this period, the engineers validate service interoperability by running end-to-end tests in each cloud and on-prem cluster, measuring performance, latency and cost.

Container & Cloud-Native Integration

During the Container & Cloud-Native Integration phase, a solution architect, DevOps engineers and an infrastructure specialist turn each application component into a standardized Docker image and wire them into a Kubernetes cluster.

They build and validate container definitions, set up a private registry and deploy services with Helm charts or equivalent manifests so that scaling, load balancing and self-healing become automatic rather than manual tasks.

This work ensures every environment — developer laptops, test servers and production clusters — runs the identical containerized artifacts, cutting out configuration drift and simplifying rollbacks.

At the same time, the team evaluates which functions and event-driven workloads map naturally to serverless offerings. They refactor suitable modules into Azure Functions, AWS Lambda or Google Cloud Run handlers, configure deployment scripts to package and publish them, and test cold-start performance and execution limits.

Parallel to that effort, they overhaul the CI/CD pipelines: replacing ad hoc scripts with infrastructure-as-code templates (for example, Terraform or ARM) and fully automated build-test-deploy workflows. The result is a set of end-to-end pipelines that automatically build containers or serverless packages, run unit and integration tests, and push to target environments with zero manual intervention — enabling rapid, reliable releases and a true cloud-native operating model.

Team Development & Skill Building

During the Skill Gap Analysis phase, evaluate your team's proficiency in containerization, cloud deployment, cross-platform debugging and modern .NET Core frameworks.

Conduct hands-on coding exercises, review recent project work, and interview developers to score each individual against the skills you'll need for migration.

Highlight specific technology areas (Kubernetes orchestration, Linux-based diagnostics or ASP.NET Core and .NET/.NET 8-10 dependency injection) where outside expertise or new hires will be necessary.

At the end of this assessment, you receive a detailed gap analysis report, can estimate the investment in hours and budget, and outline a hiring plan to fill any critical shortfalls before full-scale migration begins.

Migration Execution Strategy

During the Migration Execution Strategy phase, a migration lead and a solution architect define the order in which application modules will move to .NET Core.

They rank each module by its technical complexity, business importance and data or functional dependencies, then group any tightly linked components so they migrate together.

With that sequence in hand, they build a timeline that includes developer ramp-up time, compatibility testing, rollback plans and buffer days for unexpected integration challenges.

As each module is ready, they deploy the new .NET Core version alongside the existing .NET Framework service, routing a portion of user traffic to the updated component while keeping the legacy system live as a fallback.

This side-by-side deployment lets you shift workloads gradually, verify each conversion in production and roll back immediately if any issues arise.

Comprehensive Testing

In the Testing Strategy Expansion phase, a QA lead, QA engineers, and a performance engineer run in-depth validations of your migrated applications. They start by measuring response times, memory usage and CPU load on Windows servers, Linux hosts and in Docker containers, comparing each against pre-migration baselines to uncover any platform-specific slowdowns.

At the same time, they execute targeted tests that exercise threading models, garbage-collection behavior and memory management under .NET Core to reveal subtle stability or performance issues. Once performance and runtime characteristics are confirmed, the team runs end-to-end checks of your core business processes — data calculations, workflow operations and external integrations — across standard and edge-case scenarios to ensure every result matches the original .NET Framework behavior.

Finally, they assemble a full-scale staging environment mirroring your production infrastructure and data volumes, then execute load tests and integration drills to catch any issues with database connections, third-party services or resource contention before go-live.

Operational Stability During Transition

During the Operational Stability Maintenance phase, your solution architect, operations engineers and a performance specialist put in place the systems and processes that keep your services running without interruption.

First, they build parallel environments so your .NET Framework applications and the new ASP.NET Core and .NET/.NET 8-10 components operate side by side. A load balancer is configured to route traffic to whichever version proves most stable, with automated fail-over rules that send users back to the legacy system if any errors or performance drops occur.

Next, the team establishes a set of benchmarks — measuring response time, throughput and resource use under normal and peak loads — and updates your monitoring stack to track those metrics in real time across both environments. This lets you quantify the performance gains .NET Core delivers and spot any regressions immediately.

Finally, they schedule each cut-over during known low-traffic windows and roll out a stakeholder communication plan that alerts business owners and support teams to the migration timetable and potential service variations.

Performance Monitoring & Optimization

Performance Baseline Establishment

During Performance Baseline Establishment, a performance engineer and operations specialists run controlled load tests against your existing .NET Framework applications. They script key business workflows, simulate typical and peak user loads, and record response times, throughput rates, memory usage and CPU utilization. These measurements are stored in a centralized report.

Monitoring System Integration

Next, during Monitoring System Integration, a DevOps engineer and an application reliability manager deploy and configure APM tools that understand .NET Core internals. They analyze your services to capture garbage-collection pauses, thread-pool behavior and container resource metrics, and integrate those feeds into your existing dashboards and alerting rules. With cross-platform visibility in place, you can watch performance in real time as components move from Framework to Core.

Performance Gain Realization

Finally, in Performance Gain Realization, the same team works alongside senior developers to tune hotspots identified by the new monitoring data. They optimize critical code paths, adjust in-memory caches and right-size container resource limits. As each change goes live, engineers compare against the baseline report to confirm reduced latency, higher throughput and lower infrastructure utilization.

Key influencing factors to evaluate when choosing the best .NET Framework to ASP.NET Core and .NET/.NET 8-10 Migration Сompany

Portfolio Assessment

Portfolio Assessment Maturity describes how deeply a migration partner analyzes your existing .NET Framework applications to understand what it will take to move them to .NET Core. 

1. A mature assessment process begins with an inventory of every application’s current state — its code structure, third-party and in-house dependencies, performance characteristics and the specific business value each delivers. 
2. The vendor then categorizes applications according to the effort required for migration and the impact on your operations, distinguishing between systems that can be ported with minimal changes, those that need targeted refactoring and those that require a complete architectural overhaul. 

By treating each application according to its unique complexity and strategic importance rather than applying a one-size-fits-all approach, the partner ensures you focus resources where they will deliver the greatest return.

Technical Debt Remediation Strategy

Technical Debt Remediation Strategy defines how a migration partner identifies and resolves the hidden costs in your existing .NET Framework code before moving to ASP.NET Core and .NET/.NET 8-10. 

1. It begins with a comprehensive scan of your applications to pinpoint legacy code patterns, obsolete or unsupported libraries and fragile third-party integrations that will break or perform poorly on the new platform. 
2. The vendor uses automated tools and manual review to classify debt items by severity and impact — isolating modules that require simple updates, those that need significant refactoring and those that must be rewritten entirely. For outdated libraries, they map replacements that are fully supported in .NET Core or propose alternative solutions when direct equivalents don’t exist. 
3. Architectural anti-patterns such as monolithic designs or tightly coupled components are broken down into more modular services or refactored to leverage dependency injection and modern design patterns. Throughout this process, the partner maintains your existing functionality by writing tests, using feature toggles and staging changes in parallel environments. 

By systematically reducing technical debt — rather than forcing a lift-and-shift — they minimize rework, mitigate migration risks and ensure that the resulting codebase is maintainable, performant and ready for future .NET releases.

Business Continuity Risk Management

Business Continuity Risk Management describes how a migration partner keeps your applications running without interruption as they move from .NET Framework to ASP.NET Core and .NET/.NET 8-10. 

1. It starts with designing parallel environments so that the new .NET Core services operate alongside your existing .NET Framework systems, allowing traffic to shift gradually and fall back instantly if issues arise. 
2. The vendor defines clear rollback procedures — automated scripts or configuration switches that restore the legacy system in seconds — and tests those procedures in staging before any production cutover. 
3. They schedule migrations in phases, beginning with low-risk components, monitor key metrics in real time and provide live dashboards so you can spot anomalies immediately. If an upgrade fails or performance degrades, they trigger pre-configured fail-over routines to divert traffic back to the stable environment, run hot-fixes on isolated test beds and only reattempt cutover once the fix is validated. 
4. Throughout the process, they coordinate with your operations and support teams, document every step, and maintain communication channels so that everyone knows exactly when and how each application will switch over — minimizing downtime, preserving SLAs and protecting the end-user experience.

Financial Impact Modeling

Financial Impact Modeling Accuracy describes a partner’s ability to forecast the true costs of moving and running your applications on .NET Core by building detailed, assumption-driven financial models. 

1. A capable vendor starts by using cloud provider cost calculators and custom rate sheets to estimate your future infrastructure expenses, selecting instance types, storage tiers, operating systems and network configurations that reflect your performance and availability needs. 
2. They layer in software licensing fees, third-party support contracts and anticipated operational overhead — automation, monitoring and backup services — to produce a multi-year total cost of ownership projection. 
3. By validating their assumptions against your historical usage patterns and including sensitivity analyses for variable workloads, they ensure you see realistic budgets, break-even timelines and ROI estimates rather than optimistic guesses. 

This precision lets you make informed investment decisions and plan your migration with confidence.

Performance Benchmark Validation

Performance Benchmark Validation describes how a vendor measures throughput, latency and response times before and after migration by running the same workload scripts in identical test environments. 

They record baseline metrics on the .NET Framework system, repeat the tests on the ASP.NET Core and .NET/.NET 8-10 version, compare the two sets of measurements, investigate any regressions to locate bottlenecks, apply targeted optimizations, and provide you with the raw before-and-after data so you can see exactly where performance changed and which areas may still need tuning.

Security Architecture Transformation

Security Architecture Transformation defines how a migration partner replaces Windows-specific security controls with cross-platform frameworks while preserving encryption, access control and audit capabilities. 

1. The partner begins by mapping existing Active Directory authentication, role-based permissions and audit settings, then designs an equivalent solution using ASP.NET Core Identity or OAuth2/OpenID Connect for authentication and authorization. 
2. They inventory data at rest and in transit, apply the Data Protection API for encryption, configure TLS for transport security and integrate cloud or third-party identity services where required. 
3. Centralized logging and structured audit trails are implemented, and automated security scans, penetration tests and threat-modeling workshops verify that controls meet or exceed original standards. 
4. Finally, the partner checks compliance with regulations such as PCI-DSS, HIPAA and GDPR, and delivers the documentation needed for regulatory audits.

Vendor Stability

Vendor Organizational Stability measures whether a migration partner can sustain the long-term commitments that enterprise migrations demand. 

1. It begins with financial health indicators — revenue trends, profitability margins and debt levels — to ensure the company can fund multi-year projects without cash-flow interruptions. 
2. Team retention rates and bench strength show whether they can staff complex engagements from start to finish without losing critical expertise. 
3. Capacity planning aligns preferred team size and skills with your project’s budget and timeline, while industry experience confirms they’ve weathered similar challenges and know the domain. 
4. Geographic and time-zone coverage determine how effectively they can collaborate with your internal teams and provide follow-the-sun support. 
5. A stable leadership team, transparent governance and audited financials all point to a partner less likely to abandon a multi-phase migration before completion.

Data Quality Assurance Methodology

Data Quality Assurance Methodology describes how a migration partner systematically verifies that your data remains accurate, complete and usable throughout and after the move to ASP.NET Core and .NET/.NET 8-10. 

1. The process starts with profiling your source data to measure current levels of accuracy, completeness, consistency and validity across all tables and fields. During extraction, the vendor applies automated checks — row counts, checksum comparisons and schema validations — to ensure no records are lost or altered. 
2. As data is transformed and loaded into the new environment, they run reconciliation scripts that compare source and target datasets on key dimensions such as precision (numeric rounding), interpretability (field formats) and timeliness (timestamps and transactional order). Parallel validation environments let them catch issues before production cutover, and they maintain an audit trail of every data validation step. 
3. Post-migration, the vendor executes end-to-end test scenarios — customer lookups, report generation and batch jobs — to confirm that downstream processes produce identical or improved results. 
4. Throughout, they document validation rules, exception rates and remediation actions so you can see exactly where any data gaps occurred and how they were resolved. 

This approach guarantees that your data quality remains at or above its original level, with full transparency into every step of the migration.

Belitsoft: Leading .NET Framework to ASP.NET Core and .NET/.NET 8-10 Migration Company

Technical competency in .NET Framework to ASP.NET Core and .NET/.NET 8-10 migrations

• Over 20 years in the Microsoft ecosystem (specializing in .NET since 2004).
• Engineers perform full re-architecture of legacy .NET Framework code, replace deprecated libraries, and apply automated tooling and performance tuning for migrations to ASP.NET Core and .NET/.NET 8-10.
• Expertise spans ASP.NET Core web applications, Blazor UI, cloud-native architectures (including containerization and microservices), and legacy system modernization.

Relevant industry experience

• Healthcare. Since 2015, have built and migrated electronic health record systems under HIPAA requirements, embedding data security practices at every stage.
• Fintech. Delivered transaction-processing platforms emphasizing accuracy, high throughput, low latency, and strict security controls.

Team composition and availability

• Nearshore delivery teams based in Poland, with working-hour overlap across Central European and U.S. time zones to minimize coordination delays.
• Small, dedicated squads of .NET specialists integrate with client staff from Day 2 and scale up or down as requirements change.
• Clients receive regular updates on team composition alongside progress reports.

Project management methodology

• Agile delivery with short iterations and daily standups to keep scope, deliverables, and risks visible.
• Automated test suites and Azure DevOps CI/CD pipelines are established at project kickoff to catch issues early.
• Status reports include milestones achieved, key risks, and actual vs. planned spend.

Pricing competitiveness and value proposition

• Rates are approximately 30% below those of many Western firms due to streamlined processes and low overhead.
• Itemized cost estimates are provided before engagement. Clients choose time-and-materials or fixed-price contracts with no hidden fees.
• Ongoing transparency via regular updates on progress and actual spend enables tight ROI monitoring.