Excel and “unreadable content” when creating an Open XML spreadsheet with MemoryStream

Question

When creating an Excel spreadsheet using the Open XML SDK v2.0, our Excel output initially worked successfully for a number of months. Recently Excel (all versions) began to com

Answer 1

Use Open XML SDK 2.5 Productivity Tool for Microsoft Office to open the .xlsx file and validate the document this will give you any validation errors causing the unreadable content