Problems making a silent install within a Cusom Action in C# -

i want silently install application named instacal within custom action written in c#. in custom action installing other applications , works fine(they not silently installed!).

when silent installation of application named instacal started, nothing ever installed(i check programs , features). in custom action following:

int ms = 0; // execute instacal silently - must present on user machine! var filename = path.combine(folder3rdparty, @"instacal\instacal.msi"); process installerprocess; installerprocess = process.start(filename, "/q"); while (installerprocess.hasexited == false) {      streamwriter file = new streamwriter("c:\\test.txt", true);      file.writeline("ms: " + ms);      file.close();       thread.sleep(250);      ms += 250; } 

i writing file test how long time installaltion approximately takes. takes 3 seconds in while loop , afterwards nothing installed.

but if use same code in small console application application instacal succesfully installed silently. installation take 9 seconds complete.

so, doing wrong in code? missing important regarding custom actions? thx :)

i suggest change code following:

this uses msiexec command install package instead of calling msi directly.

int ms = 0; // execute instacal silently - must present on user machine! var filename = path.combine(folder3rdparty, @"instacal\instacal.msi"); process installerprocess; installerprocess = process.start("msiexec", string.format("/i '{0}' /q", filename)); while (installerprocess.hasexited == false) {      streamwriter file = new streamwriter("c:\\test.txt", true);      file.writeline("ms: " + ms);      file.close();       thread.sleep(250);      ms += 250; }