How to know if a cell has an error in the formula in C#

Question

In an Excel formula you can use =ISERR(A1) or =ISERROR(A1)

In a VBA macro you can use IsError(sheet.Cells(1, 1))

But u

Answer 1

You can use the WorksheetFunction method:

Globals.ThisAddIn.Application.WorksheetFunction.IsErr(...)

or

[Your Excel Object].WorksheetFunction.IsErr(...)

The IsErr is semantically identical to the Excel worksheet function, only instead of the cell reference pass in the actual value - AFAIK.