In c# How do I control which Excel opens? -

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i have excel 2010 , excel 2013 (via office 365) on machine (windows 7 home premium)

is there way control excel opens when 

 var excelapp = new excel.application();

is called?

thanks time, kw

one of possible approaches rely on dynamic com automation:

type exceltype = type.gettypefromprogid( "excel.application.[v]" ); dynamic excel = activator.createinstance( exceltype );

where

excel.application.[v] is

excel.application.14 or excel.application.15 depending on version want run.

since excel dynamic, use in same way, despite actual version:

excel.visible = true; ...

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