Column with blank values in a excel export.

Hello
I Export a Report to Excel.
That's work fine but i have a problem.
when in a detail section one value of one column is blank, the export discard the cell.
in result , the values after the blank do not corresponding any more with there header....
i find this source on this bug on the web
http://aspadvice.com/blogs/crystal/archive/2004/04/20/2199.aspx
but the solution inside that post do not work ...
any idea ?

i work with VS2008 in c# with the FW 3.5
my bug is not in design mode
the code where i format the excel export option :
ExcelFormatOptions b_Format = new ExcelFormatOptions();
b_Format.ShowGridLines = true;
                        b_Format.ExcelTabHasColumnHeadings = true;
                        b_Format.ExcelUseConstantColumnWidth = true;
                        b_Format.FirstPageNumber = p_intPageDepart;
                        b_Format.LastPageNumber = p_intPageArrivee;
                        if (p_intPageDepart != 0 && p_intPageArrivee != 0)
                            b_Format.UsePageRange = true;
l_ExportOptions.ExportFormatOptions = b_Format;
the program is a .net DLL use by a VB6 program....
The Dll is used for all Crytal works.
i show the Rpt successfuly. but when i export the rpt to excel the bug is present in the exported file.

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