How to restart service remotely?

You could use the ServiceController class like so:

ServiceController sc = new ServiceController("ArcGIS Server", "192.168.36.22");

sc.Start();
sc.Stop();

This saves you having to write all that code to interact with WMI. Note to use the ServiceController class, you'll have to add a reference to the System.ServiceProcess assembly.

Service controller didn't work for me, so I used Cmd to do it.

Process.Start("CMD.exe", "/C sc \\\\remoteMachine stop \"serviceName\"&sc \\\\remoteMachine start \"serviceName\"");

To overcome credentials issue, I used class from this https://stackoverflow.com/a/5433640/2179222 answer.

So in the end It looked like this:

    private static void RestartService(string remoteMachine, string serviceName, string userName, string password)
    {
        using (new NetworkConnection($"\\\\{remoteMachine}", new NetworkCredential(userName, password)))
        {
            Process.Start("CMD.exe", $"/C sc \\\\{remoteMachine} stop \"{serviceName}\"&sc \\\\{remoteMachine} start \"{serviceName}\"");
        }
    }