SQL Server PIVOT and UNPIVOT: Dynamic SQL Case Study
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The short answer: PIVOT turns row values into columns for reporting (row-to-column transformation), and UNPIVOT does the reverse, turning c...
How to Secure an ASP.NET Core Deployment on Linux (Nginx & Systemd)
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If you want to secure a .NET Core deployment on Linux, the short answer is this: never expose Kestrel directly to the internet, put a r...
Secure ASP.NET Core Web API JWT Authentication
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If you've already wired up JWT bearer authentication in an ASP.NET Core Web API, you've solved maybe a third of the actual security ...
EF Core Query Performance: AsNoTracking, Loading & N+1
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Most EF Core performance problems don't announce themselves. You write clean LINQ, the app works fine locally against a small seed datab...
T-SQL WHERE Clause FAQ: NULLs, Errors & Performance
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The short answer to most WHERE clause confusion in T-SQL (Transact-SQL, Microsoft's SQL dialect for SQL Server) comes down to one t...
How to Export a DataTable to CSV in C# and VB.NET (Escaping, UTF-8, Streaming)
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If you need to export a DataTable to a CSV file in C# or VB.NET, the tricky part isn't writing the rows — it's escaping the values ...
N+1 Query Problem in ASP.NET Core & EF Core: How to Fix It
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If your ASP.NET Core API feels slow under real traffic even though every individual query looks fine in isolation, there's a good chance...
REST API Interview Questions for ASP.NET Core Developers
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If you're prepping for a .NET backend interview, chances are the panel will spend at least half the conversation on REST API design and ...
Multi-Select Dropdown with Checkboxes in ASP.NET Web Forms
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A standard HTML <select multiple> control lets users choose multiple items, but the interaction is awkward: on Windows, users have to...
How to Export List to CSV in C# (Native vs. CsvHelper Guide)
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Data portability is a requirement for almost every enterprise application. Whether you are building an administrative dashboard, a reporting...