Choose .NET when your company already lives inside Microsoft, because the rest of the stack will cooperate.
Many companies run on Microsoft without ever deciding to. Staff sign in with a Microsoft account, files sit in SharePoint, and finance lives in Excel. A new system in that setting should feel like part of the building, and .NET usually does, because sign-in, files and mail already agree with each other.
It is also a mature, strictly typed platform that large teams have maintained for decades. That history shows in the tooling, the documentation and the supply of developers. Nothing about it is fashionable. That is the appeal for a system you want to forget about.
.NET is Microsoft’s platform for building software, and C# is the main language written on it. ASP.NET Core is the part that serves web pages and APIs. Your code is compiled and checked before it runs, so many mistakes surface early, long before a customer or a colleague could ever run into them. It runs anywhere. Windows, Linux and containers are all fine.
Where it earns its place.
What it is genuinely good at
It is a steady performer. Rules, records and sign-in are its home ground, and it handles them without drama.
- Business rules that must stay correct for years, such as pricing, approvals and ledgers
- Sign-in against Microsoft Entra ID, so staff use the account they already have
- Reading and writing SQL Server, which Entity Framework handles cleanly
- Desktop tools for Windows machines in an office or on a shop floor
- Background services that run quietly on a schedule
Where it turns against you
The platform is rarely the problem, but the surroundings sometimes are, and it is worth checking them with your own team before you commit to anything. Hosting is the usual snag.
- A team with no Microsoft habits and no C# developers to hand over to
- A tiny site or prototype, where the project template is more than the job needs
- Hosting plans built around PHP, where .NET is an awkward guest
- Libraries that arrive first for JavaScript or Python and later for .NET
If your people already write C#, none of this matters. If they do not, hiring becomes the real cost. Ask that question first.
Where we use it
Mostly internal. Mostly quiet.
- Internal systems for firms that run Microsoft 365 and Windows Server
- APIs that sit in front of an existing SQL Server database
- Integrations that read Outlook calendars, SharePoint lists and Teams messages
- Replacing an ageing Windows desktop program with a web application
- Scheduled jobs that move data between an ERP and a reporting store
The licensing and upkeep nobody prices at the start
The framework itself costs nothing to download. The platform around it often does cost money. Read the terms.
- SQL Server is licensed commercially, and the bill depends on how it is deployed
- Windows Server adds its own licence if you host on it, where Linux would not
- Major versions are supported for a limited window, so upgrades are a planned chore
- Old .NET Framework applications need a migration plan, not a casual update
- NuGet packages need the same review as any other dependency
How it fits with the rest of a system
Treat .NET as one part of the whole.
- A React or Angular front end talking to an ASP.NET Core API
- PostgreSQL or MySQL instead of SQL Server, when the licence is the sticking point
- Azure services where the company already holds a Microsoft agreement
- Message queues for slow work, so a screen never waits on a report
- Mobile apps built separately, calling the same API as the browser
None of this locks you to Microsoft hosting. A .NET service runs in a container on any cloud. Moving later is possible.
When this is the right choice.
- The company already uses Microsoft 365, Entra ID and Windows across the office
- Your IT team or an in-house developer already knows C# and can take over
- The system carries strict business rules where compile-time checks pay for themselves
- You need to connect to an existing SQL Server database without replacing it
- The software will be maintained for ten years by changing teams
When it is not.
- A brochure site or small landing page, where a static site is less to run
- A startup with only JavaScript developers and no plan to hire anyone else
- A budget that cannot absorb SQL Server or Windows Server licensing
- A team that wants one language across browser and server, where Node.js fits better
- Heavy data science work, where Python has the libraries and .NET does not
Questions we are asked about it.
Is .NET only for Windows?
No, modern .NET runs on Linux, macOS and Windows alike. Most new web applications are deployed on Linux in containers. Windows only matters for older .NET Framework software.
Do we need SQL Server to use .NET?
No, .NET works with PostgreSQL, MySQL and others through Entity Framework or plain drivers. SQL Server is a good partner but not a requirement. It carries a licence you may not need.
Is C# hard to hire for?
In most cities it is straightforward, especially for firms that already run Microsoft. Developers who know C# also move easily between web, desktop and background services. Hiring is rarely the worry.
Can .NET connect to Microsoft 365?
Yes, and this is one of its real strengths. Microsoft publishes official libraries for Graph, which reaches mail, calendars, SharePoint and Teams. Sign-in through Entra ID is a short job.
Should we move an old .NET Framework application?
Only after looking at what it depends on. Some applications move across with modest changes, while others lean on Windows-only features and need a rewrite. We read the code first.
How does .NET compare with Java for large systems?
They are close cousins and both suit long-lived business software. The choice usually follows the company, not the technology. A Microsoft shop picks .NET, while a firm with Java teams and Linux servers picks Spring.
Services that use it.
What it sits with.
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