Excel-2007 addin exception while closing the files

[mahesh_d]

Hi,

In Excel-2007 addin, in ShutDown functionality for clossing all open files.
I have written following

       Try
            'Close All Open documents
            Dim exlWorkBook As Excel.Workbook
            If Application.Workbooks.Count = 1 Then
                Application.ActiveWorkbook.Close(False)
            Else
                For Each exlWorkBook In Application.Workbooks
                    exlWorkBook.Close(False)
                Next
            End If
        Catch ex As Exception
            Debug.WriteLine(ex.Message)
        End Try

The exception is "Exception from HRESULT: 0x800AC472".


Any suggesstions will be helpful.


Thanks
Md