Start another application as a process

I want to run another application (a legacy application) as a process from my .NET Windows Application, and I want to hide the window of legacy application, I don't want it show up, how to do that?  I can't even hide a notepad or calculator, Notepad or Calculator still pop up, what am I missing?

private void button1_Click(object sender, System.EventArgs e)
{
Process myProcess = new Process();
try
{
myProcess.StartInfo.WindowStyle= ProcessWindowStyle.Hidden;
myProcess.StartInfo.UseShellExecute = false;
myProcess.StartInfo.CreateNoWindow = true;
myProcess.StartInfo.RedirectStandardOutput = true;
myProcess.StartInfo.FileName =@"C:\\WINDOWS\\system32\\notepad.exe";
myProcess.Start();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
      
ToneElecAsked:
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Mike TomlinsonConnect With a Mentor Middle School Assistant TeacherCommented:
To use the Hidden style, first set UseShellExecute() to TRUE:
private void button1_Click(object sender, System.EventArgs e)
        {
            Process myProcess = new Process();
            try
            {
                myProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                myProcess.StartInfo.UseShellExecute = true;
                myProcess.StartInfo.FileName = "notepad.exe";
                myProcess.Start();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

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eguilhermeCommented:
have you tried setting


myProcess.StartInfo.CreateNoWindow = true;

to false


myProcess.StartInfo.CreateNoWindow = false;
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eguilhermeCommented:
 you can also try to set the WindowStyle = ProcessWindowStyle.Hidden;
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ToneElecAuthor Commented:
Thank you for your reply.  Setting UseShellExecute() to TRUE make it work.  
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ToneElecAuthor Commented:
This is something I don't understand, yesterday I set UseShellExecute() to TRUE, just as Idle_Mind mentioned, it worked and it hide the process window, no matter notepad, calculator or my program.  However, today it only hide notepad, not calculator, or my program.  What's going on?
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Mike TomlinsonMiddle School Assistant TeacherCommented:
It's possible you have a bug in your program and it's not compiling...and you are running a version that is not current?

Otherwise show us your current code...
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ToneElecAuthor Commented:
Idle_Mind:

I made my executable program (VC++ 6.0) dialog box disabled, so it will run as a process, doesn't pop up the window.  Your program can successfully hide Notepad, for some  reason, it doesn't hide Calculator.  Is there a difference between those two?   I am using Microsoft Visual Studio 2003.
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Not sure why some windows don't like being hidden...sorry.

Can you give the "big picture" of your project?  Maybe there is another approach that would work.
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