“You’re not writing Excel,” he muttered. “You’re resurrecting a corpse every time.”
Processing: 63,000 rows. 24 columns. Formulas that referenced only the current row. No inter-sheet dependencies. Time to generate: 1.2 seconds. Peak memory: 142 MB. epplus
He’d written this C# console app three years ago. Back then, it was a scrappy script using EPPlus 4.5, just to save his team two hours of manual copying and pasting. Now, the system had metastasized. It pulled from three APIs, two SQL databases, and a CSV vomited out by a legacy mainframe in the basement. “You’re not writing Excel,” he muttered
I understand you're asking for a "deep story" about EPPlus, the .NET library for Excel files. I'll draft a narrative that explores the technical, human, and almost philosophical layers beneath a seemingly routine task—generating a spreadsheet. The Ghost in the Grid Formulas that referenced only the current row
