C# Excel 2010 Workbook Open error

Question

We recently upgraded from Excel 2007 to Excel 2010, and we have found that existing code started failing.

Exception Message:

Office has detect

Answer 1

Have a look at using Application.FileValidation Property (Excel) before your Open statement.

Returns or sets how Excel will validate files before opening them. Read/write

Files that do not pass validation will be opened in a Protected View window. If you set the FileValidation property, that setting will remain in effect for the entire session the application is open.

You can set it to one of the enum values in MsoFileValidationMode Enumeration

msoFileValidationDefault

msoFileValidationSkip

if you set it to msoFileValidationSkip before the Open statement, it should bypass the check.

Something like

excelApp.FileValidation = MsoFileValidationMode.msoFileValidationSkip;

before the open statement.