msi file is not installed in silently mode.

i want to create a windows application which is install a msi file in silently mode , when i use the /qb or /qr it's work but when i tried to used /qn, the msi file isn't installed. below is full code for installing silently.
 

Process process = new Process();
process.StartInfo.FileName = "msiexec.exe";
process.StartInfo.Arguments = string.Format("/qn /i \"{0}\" ALLUSERS=1", "C:\\WinAppDemoSetup_3.msi");
process.Start();
process.WaitForExit();

 
please resolve my problem or give me another way to perform this task.