Question

How we can detect that MS Excel is installed in Silverlight 4 and C# ?

Can I use somehow this code or ??

  dynamic excelApp;
  excelApp = AutomationFactory.CreateObject("Excel.Application");
  if (excelApp != null)
   {
      // MS Excel is installed!
   }

Thank you!

Answer 1

check this registry path:

HKLM\Software\Microsoft\Office\12.0\Excel\InstallRoot::Path

Replace 12.0 (for Office 2007) with the corresponding version number:

Office 2000 -  9.0
Office XP   - 10.0
Office 2003 - 11.0
Office 2007 - 12.0
Office 2010 - 14.0

check this link for more info.