Note: this article was drafted with AI assistance and reviewed by Softinbit Technology before publishing. It is part of the series The .NET Field Guide .

How one team moved Store.Api to .NET 10 before .NET 8 support ended, and the exact fix for every break they hit on the way.

Part of "The .NET Field Guide". Section: Case Studies.

TL;DR

.NET 8 and .NET 9 both lose support on November 10, 2026. This case study moves a production API straight to .NET 10 LTS and walks through every break the team hit.

Most breaks were loud build errors (obsolete IPNetwork, Swashbuckle 10, EF Core 10 ExecuteUpdate). Two were silent: a missing exception log that muted an alert, and 401s where tests expected cookie redirects.

You get before/after code for each fix, a temporary net8.0/net10.0 CI matrix, and a checklist to run on your own project.

Level: Advanced · Prerequisites: ASP.NET Core Web API and EF Core experience, basic Docker and CI · Reading time: 12 min

This is an illustrative case study.…