how to run a exe in process without visible to the user using c#

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C#

I want to run B.exe when I open my A.exe.

I have used the below code to run the EXE as a background process from my main executable(A.exe).

ProcessStartInfo stInfo = new ProcessStartInfo();
stInfo.FileName= "B.exe";
stInfo.WindowStyle = ProcessWindowstyle.Hidden;
Process p = new Process();
p.StartInfo = stInfo;
p.Start();

But B.exe is appearing in the screen..

I want to run B.exe without user's knowledge.......

What I did wrong....

Help me...

Thanks
Mydeen.