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How to start linux systemd service in C# programmatically on Ubuntu Server?

I have a very simple question:
How to start / stop a systemd service from a .NET 6.0 Console App?
Just to clarify: I do not want the service to stop itself. I want a console app to stop another service already installed on a Ubuntu Server 20.04.
More concrete: How would I call this line in C# properly?
sudo systemctl start SERVICE_NAME
Do I have to start a Process like this?
var process = new Process();
process.StartInfo.FileName = " /usr/lib/systemd"
process.StartInfo.Arguments = "start SERVICENAME";
process.Start();
What have I tried so far?
I googled but could not find any viable solution, and since I am no expert on Linux I might have fallen into the XY trap

I've never done this before. I like .NET and I use netcore every day but, if you want to create a script to be run only on linux. Maybe a bash script would do.
Since you want to use .NET, I think you'll need to do something like:
ProcessStartInfo startInfo = new ProcessStartInfo() { FileName = "/bin/bash", Arguments = "systemctl stop SERVICE", };
Process proc = new Process() { StartInfo = startInfo, };
proc.Start();
You're creating a bash instance from where you call systemctl.
You also might want to wait until the process has finished. You can do that with
proc.WaitForExit();
Be aware this is a synchronous waiting.

Starting a process

As part of SharePoint automation testing, I am trying to open Internet Explorer as another user by using the System.Diagnostics.Process . Here is the following C# code
System.Diagnostics.Process p = new System.Diagnostics.Process();
// Domain and User Name:
p.StartInfo.Domain = "MYDOMAIN";
p.StartInfo.UserName = "myusername";
// Command to execute and arguments:
p.StartInfo.FileName = "C:\\Program Files (x86)\\Internet Explorer\\iexplore.exe";
p.StartInfo.Arguments = "http://url/AllItems.aspx";
// Build the SecureString password...
System.String rawPassword = "thepassword";
System.Security.SecureString encPassword = new System.Security.SecureString();
foreach (System.Char c in rawPassword)
{
encPassword.AppendChar(c);
}
p.StartInfo.Password = encPassword;
// The UseShellExecute flag must be turned off in order to supply a password:
p.StartInfo.UseShellExecute = false;
p.StartInfo.CreateNoWindow = false;
p.Start();
When I run this automated test Visual Studio returns informing me that the test was successful, however Internet Explorer does not open.
Is there something in my code I am missing in order for a window to appear? There is no iexplore process running prior to the test being run.

putting double quotes around the file path (since it contains spaces) may help:
p.StartInfo.FileName = "\"C:\\Program Files (x86)\\Internet Explorer\\iexplore.exe\""
^^ ^^
In addition, if your intention is to start this from a service process or dll running in a service such as "SharePoint", then this code will probably not launch the process in the desktop desired. You'll need to set the desktop to "winsta0\\default" in the startup info.

To run a process the worker process should have high privileges and this is not an ideal case in any web application. If your purpose is to use IE for unit testing then I would consider using something like WaitIN. If your purpose is for application logic to access a URL and do something then consider using HttpWebRequest. If you still need a process to be started then create a Windows Service and then expose a web call so in Share Point you can just make a call and your Windows Service can run on local account or some other high privilege account.
Hope this helps and please provide the scenario why you want to start the IE and that can give you a better answer in the forum.

Execute batch file in client page

I have the below command which run batch file, I need to run this batch when I open the ASPX page in the machine browser to affect the machine and not affect server :
ProcessStartInfo psi = new ProcessStartInfo(this.WhiteLabel.Text);
psi.RedirectStandardOutput = false;
psi.WindowStyle = ProcessWindowStyle.Hidden;
psi.UseShellExecute = true;
Process.Start(psi);

This is not possible because of security concerns. The only possible way might be to create an ActiveX library that the user would acknowledge and accept on their browser to run. What are you trying to run on the client? Maybe there is another approach?
This has been asked before see here...
How to execute an application on the client from a website?

Communication via stdout/stdin between py2exe executable and C# program

So here's my problem:
Python scripts launched from C# via the Process class require the -i switch to be passed to python.exe or else they don't send any output when I redirect the StandardXxx streams
I want to bundle my Python program with py2exe (or another similar setup, if one meets my needs)
py2exe does not seem to let me pass the -i switch in any obvious way, but it's giving my the same issue as running python.exe - it doesn't output anything when launched by my C# program. So I need a way to force it into a similar mode so I can actually receive and send messages over stdin/stdout. I found some similar problems when it's built with "windows=['my_script']" but I built it with "console=['my_script']", so those fixes didn't help, and I don't need an actual interactive mode (i.e. the REPL), but for some reason the -i switch fixes the console IO issues.
This is the code I'm using to launch it:
ProcessStartInfo psi = new ProcessStartInfo();
psi.UseShellExecute = false;
psi.RedirectStandardInput = true;
psi.RedirectStandardOutput = true;
psi.RedirectStandardError = true;
psi.FileName = "py2exe_program.exe";
Process p = Process.Start(psi);
// program hangs here because ready message is never printed
p.StandardOutput.ReadLine(); // Consume ready message
The executable works as expected when launched externally, and the above code works when I launch the Python script via "python.exe -i my_script.py" but it runs into the same problem without the -i switch.
How do I get it to behave as expected?

How to call buggy .dll in new process?

I have a c# windows service application that is crashing without throwing an exception when processing certain files using a third-party .dll. What I decided to do was create a new console application which replicates a small portion of the windows service code, particularly the part the causes the service to crash. What I want to do is call the new .exe program from the windows service, and if it crashes, I throw an exception myself.
So, I need to call this .exe program (not in the background as I can't allow the windows service to continue until I know the file to be processed is safe), and then determine if it exited successfully or not. How do I go about doing this? The examples I've seen run the .exe in a background process which is not what I want.
Thanks.

Look at this SO answer how to run console application from windows service. Just add WaitForExit, like this :
ProcessStartInfo info = new ProcessStartInfo(#"c:\myprogram.exe");
info.UseShellExecute = false;
info.RedirectStandardError = true;
info.RedirectStandardInput = true;
info.RedirectStandardOutput = true;
info.CreateNoWindow = true;
info.ErrorDialog = false;
info.WindowStyle = ProcessWindowStyle.Hidden;
Process process = Process.Start(info);
process.WaitForExit();
In console application you can set exit code if you exit with Environment.Exit(statusCode) or return int value from main function of console applicaiton. Or you can write to output and then in your service examine exit code (process.ExitCode) or output stream so you can determine is process was exited successfully.