How to call an .exe as a service programmatically in C#

I am having a Form : InstallerForm.cs

public partial class InstallerForm : Form
    {
      private void InstallerForm_Load(object sender, EventArgs e)
      {
       //Check if service is installed
       //ServiceInstaller.ServiceIsInstalled("MyServiceName");
      }
    }
    
    public class ServiceInstaller
    {
     private const int STANDARD_RIGHTS_REQUIRED = 0xF0000;
     private const int SERVICE_WIN32_OWN_PROCESS = 0x00000010;
    
     [StructLayout(LayoutKind.Sequential)]
     private class SERVICE_STATUS
     {
      public int dwServiceType = 0;
      public ServiceState dwCurrentState = 0;
      public int dwControlsAccepted = 0;
      public int dwWin32ExitCode = 0;
      public int dwServiceSpecificExitCode = 0;
      public int dwCheckPoint = 0;
      public int dwWaitHint = 0;
     }
    
     [DllImport("advapi32.dll", EntryPoint = "OpenSCManagerA")]
     private static extern IntPtr OpenSCManager(ServiceManagerRights dwDesiredAccess);
      
     public static bool ServiceIsInstalled(string ServiceName)
     {
         IntPtr scman = OpenSCManager(ServiceManagerRights.Connect);
          try
          {
             IntPtr service = OpenService(scman, ServiceName,
             ServiceRights.QueryStatus);
             if (service == IntPtr.Zero) return false;
             CloseServiceHandle(service);
              return true;
           }
           finally
           {
              CloseServiceHandle(scman);
            }
       }
    }
      [Flags]
      public enum ServiceManagerRights
        {
            Connect = 0x0001,
            CreateService = 0x0002,
            EnumerateService = 0x0004,
            Lock = 0x0008,
            QueryLockStatus = 0x0010,
            ModifyBootConfig = 0x0020,
            StandardRightsRequired = 0xF0000,
            AllAccess = (StandardRightsRequired | Connect | CreateService |
            EnumerateService | Lock | QueryLockStatus | ModifyBootConfig)
        }

This is my initial code to check MyService is installed or not. But on this point

IntPtr scman = OpenSCManager(ServiceManagerRights.Connect);

I am getting an Exception like "System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' "

Is it because of the [DllImport("advapi32.dll")]
can i get any assistance on this??