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GANESH KUMAROct 14 · 4 min read

PayPal integration in ASP.NET Core: a safe checkout flow with Orders v2

Adding a PayPal button takes an afternoon. Making sure you never lose money, never ship unpaid orders and never charge for an order you didn't save takes more care. This is the PayPal checkout flow I

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GANESH KUMAROct 14 · 4 min read

ASP.NET Core settings in the database: change config without a redeploy

appsettings.json is great for things developers change: connection strings, logging levels. It's a poor fit for things a store owner changes: the contact email, whether PayPal is enabled, the shipping

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Rahmat AfridiOct 1 · 10 min read

Ollama ASP.NET Core: Running Local LLMs (and Switching to OpenAI with One Setting)

My Ollama ASP.NET Core setup starts with a boundary: business services should not know where a language model runs. They should request an answer or an embedding through an interface, while configurat

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APITube News APISep 27 · 14 min read

A news feed in C# with ASP.NET Core

The /api/news endpoint below answers in 874 ms when it has to ask the news API and in 0.9 ms when IMemoryCache already holds the page. That is the number most tutorials leave out, and it is the reason

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Coding DropletsSep 16 · 13 min read

How to Build Incremental RAG Indexing in .NET: A Real-World Walkthrough

Incremental RAG indexing is what separates a demo knowledge base from one you can still trust six months later. The first ingestion run is easy: read every document, chunk it, embed it, write it to a

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Coding DropletsSep 12 · 10 min read

How to Unit Test IChatClient in .NET Without Calling a Real Model

The first AI endpoint you ship is exciting. The first AI endpoint you try to unit test IChatClient against is where the excitement stops. Your test suite suddenly needs an API key, costs money per run

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Coding DropletsSep 11 · 11 min read

.NET Container OOMKilled in Kubernetes: Root Cause and Fix

The pod restarts at 3 AM. No exception, no stack trace, no shutdown log - the process is simply gone. kubectl describe pod tells the whole story in three lines: Last State: Terminated Reason:

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Coding DropletsSep 10 · 12 min read

Azure OpenAI Content Filter Errors in .NET APIs: Causes and Fixes

The first time an Azure OpenAI content filter error hit one of our production .NET APIs, it did not look like a content filter error at all. It looked like a flaky provider: a burst of 400 Bad Request

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Coding DropletsSep 9 · 11 min read

How to Stream Large CSV Exports in ASP.NET Core: A Real-World Walkthrough

Every internal API eventually grows an export endpoint, and it is almost always the same story. Somebody in finance asks for "the transactions as a spreadsheet", a developer adds GET /transactions/exp

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Coding DropletsSep 8 · 12 min read

LLM Tool Call Loops in .NET: Root Cause and Fix

An LLM tool call loop is one of the few production failures in a .NET AI endpoint that costs you money while looking completely healthy. There is no exception. There is no 500. There is a request that

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PayPal integration in ASP.NET Core: a safe checkout flow with Orders v2

ASP.NET Core settings in the database: change config without a redeploy

Ollama ASP.NET Core: Running Local LLMs (and Switching to OpenAI with One Setting)

A news feed in C# with ASP.NET Core

How to Build Incremental RAG Indexing in .NET: A Real-World Walkthrough

How to Unit Test IChatClient in .NET Without Calling a Real Model

.NET Container OOMKilled in Kubernetes: Root Cause and Fix

Azure OpenAI Content Filter Errors in .NET APIs: Causes and Fixes

How to Stream Large CSV Exports in ASP.NET Core: A Real-World Walkthrough

LLM Tool Call Loops in .NET: Root Cause and Fix