Problem reading some excel files


I am reading excel files as follow;

 Dim oXL As excel.Application
        Dim oBook As excel.Workbook
        Dim oSheet As excel.Worksheet

        'create app    
        oXL = CreateObject("Excel.Application")
        oXL.DisplayAlerts = False

        'creat workbook
        oBook = oXL.Workbooks.Open("C:\070206_shb_rh_s05_activité_CG100.xls", Type.Missing, True, Type.Missing, Type.Missing, Type.Missing, False, Type.Missing, Type.Missing, Type.Missing, False, Type.Missing, Type.Missing, Type.Missing, Type.Missing)

        'selecting sheets/renaming sheets
        oBook.Worksheets("BALANCE AGEE").Select()
        oSheet = oBook.Worksheets("BALANCE AGEE")

        Dim str As String = oSheet.Range("B6").Value

For some files its fine. But for others, I get an error at this line:
        oBook.Worksheets("BALANCE AGEE").Select()

For the files I am having problems,  I get a warning stating that the workbook contains external links. It asks whether it shoold update or ignore. No matter my choice i get:

[COMException (0x8002000b): Index non valide. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))]
   Microsoft.Office.Interop.Excel.Sheets.get__Default(Object Index) +0
   test2.Page_Load(Object sender, EventArgs e) in C:\Documents and Settings\BABA\Mes documents\Visual Studio 2005\sifca\test2.aspx.vb:27
   System.Web.UI.Control.OnLoad(EventArgs e) +88
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3035

Can someone  help me on this?


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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
think line:

oBook.Worksheets("BALANCE AGEE").Select()

can be omitted in your case here, what if you removed/remarked this line?
bkouroumaAuthor Commented:
I still get the error.

Also I need to make sure that annoying warning does not come up.

Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
Can you make sure every excel documents got a worksheet called as "BALANCE AGEE" ?
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bkouroumaAuthor Commented:
Yes, it does. The document I am reading does have ."BALANCE AGEE"

As matter of fact, here is the actual docé_CG100.xls

Thanks for your time.
bkouroumaAuthor Commented:
Thanks, the problem was indeed the name in the sheet contained empty string as in ."BALANCE AGEE  ".
Is there a way to rename the sheet  "BALANCE AGEE"?


Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
try replace:

oSheet = oBook.Worksheets("BALANCE AGEE")


oSheet = oBook.Worksheets(1)

To trim a worksheet's name, try like:

oSheet.Name = Trim(oSheet.Name)

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bkouroumaAuthor Commented:
Thanks, I tried that but i was doing oSheet = oBook.Worksheets(0) for the first sheet. lol
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