Excel:Handle exception for workbook.open

Possible Duplicate:
Why does Office 2010 fail to open an Excel file?

How to handle exception in "C#" for the errors like->

"System.Runtime.InteropServices.COMException (0x80070BBC): Office has detected a problem with this file. To help protect your computer this file cannot be opened.
at Excel.Workbooks.Open"

Few excels work without error,but few throw above error. Please suggest some answers. Thanks.