Building an Input Sheet Users Can't Break — Data Validation, Cell Notes, and Sheet Protection in ReoGrid V5
The moment you put a grid on screen, someone deletes a formula and types "12,000 USD" into a price column. ReoGrid V5 ships the three Excel tools that stop that — data validation, cell notes, and sheet protection — and they do genuinely different jobs. We build a quotation template in C# and cover the Excel-compatible gotchas along the way — paste is never validated, the password is not encryption, and two permission flags default the other way.
