C# guides with practical examples for async programming, testing, language features and performance in .NET applications, written by Benjamin Abt.
builder.Services.AddProblemDetails() registers infrastructure. It does not create an error contract. An ASP.NET Core request can fail during binding, validation, authentication, authorization, endpoint execution, …
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Retries are the most visible resilience strategy and the easiest one to misuse. Repeating a failing call can recover from a short network problem. It can also multiply load, repeat a write and keep working long after the …
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ASP.NET Core 11 has no single feature that fundamentally changes how web applications are built. That is not a criticism. Mature frameworks improve by removing custom infrastructure, tightening defaults and making common …
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Microsoft Agent Framework is the successor to the agent capabilities in Semantic Kernel and AutoGen. That statement is easy to misread as “replace the package and rename a few classes.” The migration is more …
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An MCP server can look deceptively small. A package is installed, a method receives an attribute and ASP.NET Core maps an endpoint. That is enough for a demonstration. It is not enough for a server that is allowed to …
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Temporary data is easy to create and surprisingly difficult to remove reliably. Sessions, idempotency keys, import buffers, transient integration responses, processed-message markers and short-lived audit records all …
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Applications that do not use ASP.NET Core Identity still need a disciplined password-storage design. This often leads to a requirement phrased as “password encryption.” That phrase is dangerous because encryption is …
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The 2.0 release of the official Model Context Protocol (MCP) C# SDK is more than a version increment. It implements the 2026-07-28 MCP specification revision, which changes the default shape of MCP over HTTP. The …
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Time is an external dependency. That may sound unusual at first because DateTime.UtcNow is available anywhere without configuration. This convenience becomes a problem as soon as business rules depend on the current …
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Error responses are part of an API contract. Still, many systems grow them incidentally: one endpoint returns { "error": "not found" }, another returns an array of validation errors, a gateway adds its own structure and …
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