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Connection string to xls and xlsx files

This connection string works when I connect to an xls file, but not an xlsx file.

           ConnString = String.Format("provider=Microsoft.Jet.OLEDB.4.0; " & _
                "data source='{0}';" & _
                "Extended Properties=""Excel 8.0; IMEX=1; HDR=No;""", _
                InputFile)

How can I make it work for an xlsx file?
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Rikin Shah
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AlHal2
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ASKER

With this connection string  I got a message

An OLE DB Provider was not specified in the ConnectionString.  An example would be, 'Provider=SQLOLEDB;'.

"Microsoft.ACE.OLEDB.12.0; data source=C:\test.xlsx;Extended Properties="Excel 12.0;";"
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Rikin Shah
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ASKER

Thanks.  I modified it slightly and it worked.

"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Test.xlsx;Extended Properties="Excel 12.0; IMEX=1; HDR=No;""