Execute a .EXE from Web Application

May be your process has already finished, when you look it?
Also try this code:

        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.FileName = "YourFileName.exe";
        startInfo.WindowStyle = ProcessWindowStyle.Hidden;
        try
        {
            using (Process exeProcess = Process.Start(startInfo))
            {
                exeProcess.WaitForExit();
            }
        }
        catch
        {
            //your errors
        }

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First of all:

MYOWN.EXE is in Windows/system32 folder

Guess why it's called Windows/System32.. it should not be in that path.

Then: What kind of web "application" is it? Cause the normal approach is using a Windows service for that, and let the web "application" talk to it.

And for your actual problem: Do you get an exception? When not, what does Start() return?

Finally: use the full qualified file name. Don't rely on PATH.

I tried the suggested code, didnt do the trick (it works fine with notepad.exe but not the .exe I want)
I have given full permission to file, from network services to Everyone
I have moved it to another folder and ensure permission is there
I have ensured the file is not executing
I have used the fully qualified file name
... I am not sure what else i can do here.
Oh i even tried impersonating it that part of the code as admin, didnt work!

did u try to put and link that .exe in another folder, rather  than System folder for testing purposes? will that worked for you?

BTW, my application , literally has "1" button on the page, which links to the running a .exe file. thats all, its super simple.

I put it in C:\Scripts\MYOWN.exe
and it did not work.

my application , literally has "1" button on the page, which links to the running a .exe file. thats all, its super simple.

is that button trying to launch an exe that resided in local machine or at server end?

the .exe file is on the same server as IIS is in. so its local to IIS.

    protected void Button2_Click(object sender, EventArgs e)
    {
       
            ProcessStartInfo startInfo = new ProcessStartInfo();
            startInfo.CreateNoWindow = false;
            startInfo.UseShellExecute = false;
            startInfo.FileName = "notepad.exe";
            startInfo.WindowStyle = ProcessWindowStyle.Hidden;
            try
            {
                using (Process exeProcess = Process.Start(startInfo))
                {
                    exeProcess.WaitForExit();
                }
            }
            catch
            {
                //your errors
            }
        }

Select allOpen in new window

when i click on the button, I see Notepad in TaskManager under username "Network Service"
I replace notepad.exe with myown.exe ... and nothing happens !

so its local to IIS.

ok, meaning to say... you trying to launch an exe at server end?

Correct. the .exe is local to the server.

UPDATE: I changed the IIS POOL to run under an admin user instead of Network Services and it worked ! so i am assuming its a permission issue.

ok, so indeed it's permission issue as highlighted in my first comment, does it helped? glad that you resolved it, anyway.

as proposed.