@codingdroplets

Coding Droplets

@codingdropletsJoined April 2025

Build, Scale & Master .NET with Clean, Practical Tutorials

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Coding Droplets's blogs

Coding Dropletscodingdroplets.com322 posts

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CDCoding Dropletscodingdroplets.com1d ago · 10 min read

Preventing Path Traversal in ASP.NET Core File Download APIs

Every API that serves a file eventually grows an endpoint that takes a filename from the client. It ships as a two-line convenience, it works, and it becomes the most dangerous route in the service. P

CDCoding Dropletscodingdroplets.com2d ago · 11 min read

Unable to Resolve Service for Type in ASP.NET Core: Causes and Fixes

You start the API, hit any endpoint on a controller, and the request dies before a single line of your code runs: System.InvalidOperationException: Unable to resolve service for type 'MyApp.Applicatio

CDCoding Dropletscodingdroplets.com3d ago · 11 min read

Migrating from MediatR to Wolverine in .NET: A Step-by-Step Guide

If your team is planning to migrate MediatR to Wolverine, the good news is that the mechanical part is far smaller than it looks. MediatR handlers are already single-responsibility classes with one me

CDCoding Dropletscodingdroplets.com4d ago · 11 min read

Maximum Context Length Exceeded in .NET AI APIs: Causes and Fixes

The chat endpoint works fine in testing. It works fine for the first dozen messages in a real conversation. Then a user who has been going back and forth all afternoon sends one more message and gets

CDCoding Dropletscodingdroplets.com6d ago · 10 min read

Prompt Versioning in .NET AI APIs: Treating Prompts as Code

Someone changes eleven words in a system prompt, quality drops for a subset of requests, and nobody can say when it happened or what the previous wording was. That is the failure that makes prompt ver