c# - Directory.Exists not working in wix installer custom action -

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i have customaction wix installer in checking whether directory exists. though directory exists, if condition resolving false. strange thing same snippet works in console application. here code. 

string msonline = path.combine(environment.systemdirectory, "windowspowershell", "v1.0", "modules", "msonline");   session.log(msonline); //'c:\windows\system32\windowspowershell\v1.0\modules\msonline'.   if (directory.exists(msonline))   {       session.log("msonline module installed");       session["azure_module"] = "installed";   }

not being able head around why not working when same code works in console app.


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