aka The Bald Bearded Builder
Bringing smiles to the syntax — because laughter is the best error handler.
Learnings about .NET, JavaScript, Cloud, AI, and family.
Time bugs are sneaky and expensive, but they do not have to be. This post shows a practical UTC first approach for ASP.NET Core using DateTimeOffset and TimeZoneInfo. You will learn how to design your data model, return UTC from APIs, convert to a user’s local time, and avoid DST traps without hard coded offsets. We will also wrap conversions in a clean service and make time testable with TimeProvider.
Your API should feel like a collection of small, focused stories, not a scavenger hunt through Services and Interfaces. This tutorial shows how to build a feature first Vertical Slice Architecture in ASP.NET Core using Minimal APIs, MediatR, and FluentValidation. You will see how commands and queries stay tidy, how validation runs before handlers, and how the folder structure reduces friction as your API count grows.
Parallel.ForEach feels like a free speed boost, until it slows your app to a crawl. This post explains when parallel loops shine, when they backfire, and how to avoid the classic traps. You will see small runnable C# examples for CPU bound work, shared state pitfalls, and I/O scenarios. We will also cover safer async alternatives, thread local aggregation, and simple tuning with ParallelOptions. By the end, you will know how to pick the right approach and measure the impact with confidence.
Join me for live coding sessions where I'm building Microsoft PowerToys. We laugh, we learn, and occasionally we break things spectacularly.
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