How do I run as administrator C# program in startup?

In addition to Richard's advice, here's a trick I used to allow an application to start at startup:
In your application check if it is run with admin rights, if not then restart it asking for admin rights.
At the moment I do not have my source code at hand, but I will post it tomorrow if you want it.

// Program

        public static bool IsAdministrator()
        {
                WindowsIdentity identity = WindowsIdentity.GetCurrent();
                WindowsPrincipal principal = new WindowsPrincipal(identity);
                return principal.IsInRole(WindowsBuiltInRole.Administrator);
        }


// Form1

        private void Form1Shown(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;
            this.Run1();
            this.Cursor = Cursors.Default;
        }

        private void Run1()
        {
            if (!Program.IsAdministrator())
            {
                // Restart and run as admin
                var exeName = Process.GetCurrentProcess().MainModule.FileName;
                ProcessStartInfo startInfo = new ProcessStartInfo(exeName);
                startInfo.Verb = "runas";
                startInfo.Arguments = "restart";
                Process.Start(startInfo);
                Application.Exit();
            }
		}

Also one option is to start new process with elevated privileges. Have a look at the example in Option 2 in the beginning of Directory size browser[^]