Daily notes on .NET, C#, EF Core, MAUI, Blazor, and Flutter - for developers who ship.

The version exists, but the pipeline cannot see it. Check the build identity's feed role, the feed view in the URL, which nuget.config the task uses, package source mapping, and the 30-minute HTTP cache.

MudBlazor 9.12.0 fixes a long-standing race in MudAutocomplete, MudDataGrid and MudTable: the result of the search that finished last used to win, not the one started last. Here is how the fix works and what changes for your ServerData and SearchFunc code.

If a specialist agent is just a model loop wrapped around a few read-only calls into your own services, collapse it into a skill served over MCP: a SKILL.md plus typed tools that the parent model calls directly. Keep it an A2A agent when it needs its own model, private context, a long multi-step workflow or an independent lifecycle. Here is the decision matrix, the measured cost of each path, and the Agent Framework 1.17 wiring.

Run the orchestrator on claude-opus-5-5, give implementer and reviewer subagents claude-sonnet-5-5, and send search, triage and summarizing work to claude-haiku-5-5 at medium effort. Here is the role matrix, the cost math per subagent run, Haiku 5.5's 100k-token price cliff, and the Claude Code model-resolution rules that silently override your choice.

Code resolved a service from a DI scope or root provider after it was disposed. Capture IServiceScopeFactory instead of IServiceProvider and create a fresh scope where the work runs.

CS8618 is checked when the constructor exits, and [MemberNotNull] on a static method is silently ignored for instance members. Pass the values into a private constructor instead.

The Set-Cookie header is sent, but the browser rejects or never stores it. Fix SameSite=None without Secure, missing credentials: 'include' plus AllowCredentials, consent policy, and late Append calls.

Infragistics open-sourced more than 50 Ignite UI for Blazor controls under MIT, shipped as IgniteUI.Blazor.Lite and IgniteUI.Blazor.GridLite 1.0.0 for net8.0, net9.0 and net10.0. Here is what is free, how to wire it up, and the gotchas.

Turn on the local sandbox for everyday Copilot CLI work, move to a cloud sandbox when the code or the task should never touch your laptop, and use a dev container when the team needs the same reproducible toolchain. Compared on Copilot CLI 1.0.104: what each boundary isolates, what it leaks, what it costs, and how to stack them.

EF Core never updates a key value on a tracked entity. Stop copying the key from DTOs, use a unique index instead of an alternate key, and change a real key by inserting a new row and deleting the old one. Tested on EF Core 10.0.14.