.NET 10 was released on 11 November 2025 as a Long Term Support version, with three years of support running to 10 November 2028. For a team running a management system on .NET 8, the practical question is not "what is new" but "what is worth upgrading for, and when". This article goes through the changes that actually matter for business management software.
Why the LTS milestone matters
.NET 8 was the previous LTS release, and every LTS version has an end-of-support date after which the system stops receiving security fixes. For management software that lives for years, upgrading should be a planned, recurring activity rather than something rushed when the security team asks.
Four changes worth adopting
1. Passwordless sign-in with passkeys
ASP.NET Core 10 adds Web Authentication (passkey) support. For an internal system this is the shortest path to eliminating shared passwords and reducing credential leakage — the cause of a meaningful share of intrusions. If your staff already have Windows Hello machines or phones with biometrics, users have almost nothing new to learn.
2. EF Core supports json and vector types
EF Core 10 can use the database's native json type with full LINQ support, and supports SQL Server 2025's vector type for AI workloads. The json type solves a familiar ERP problem: per-customer extension fields you do not want to model as extra tables. The vector type opens the door to semantic search inside the business database instead of standing up a separate system.
3. LeftJoin and RightJoin as LINQ operators
It sounds small but comes up constantly: writing a left join in LINQ previously meant GroupJoin plus SelectMany plus DefaultIfEmpty — long, hard to read and easy to get wrong. Now there are direct operators. For management reporting, where left joins are everywhere, this makes code markedly clearer.
4. Runtime performance
This release improves the JIT compiler (inlining, devirtualization), adds support for newer instruction sets on Intel and Arm64, and reduces garbage collection pause times on Arm64 by roughly 8–20% through write-barrier improvements. If your system runs on Arm servers — increasingly common in the cloud because they cost less — this part is worth having.
What can wait
OpenAPI 3.1, YAML document generation, better validation for nested objects, automatic memory pool eviction to reduce footprint — all good, but none of them is a reason to pull the upgrade schedule forward.
How to upgrade safely
- Read the breaking-changes guide before touching a line. Most of the upgrade effort is not in the version number but in third-party libraries that have not caught up.
- Framework first, features second. Ship one release that only changes the platform version, with no new functionality — so that when something breaks you know where it came from.
- Measure before and after. Record response times for a few heavy operations beforehand, so you know whether the performance change is real or imagined.
- Test the database layer hardest. Every EF Core version changes query generation slightly; this is where problems surface after an upgrade.
Sources
Feature details come from Microsoft's official release announcement; the priority assessment is NinePlus's own view, based on how enterprise management systems are used.
