Diagram comparing standard index operations requiring Key Lookup operations versus covering indexes that perform Index Seek operations without additional lookups

High-Volume File Processing in C#: Efficient Patterns for Handling Thousands of Files

Ever tried to build an import tool that needs to process thousands of CSV files at once? I have, and I learned the hard way that simply starting a thousand file operations simultaneously is a recipe for disaster. Let’s talk about how to handle this real-world problem in C#. I’ll show you some practical ways to process huge batches of files without bringing your system to its knees. We’ll look at how to use tools like SemaphoreSlim and Task.WhenAll, plus some smart ways to handle async file operations. ...

June 23, 2025 · 12 min · 2449 words · Abhinaw