How to run simulation case using "ocean petrel API" from console application in C#

Question

I found these links similar to my question. But they are run as part of the plugin.

Standalone application with Petrel and Ocean

How to run a simulation case using CaseRunner function?

My requirement is to call Ocean Petrel API to run eclipse and get the results back to in my application.

Does anybody have any idea?

I have checked this link but this is running as part of the plugin, not outside the Petrel.

I have tried the following code. I am getting null reference exception at SimulationRoot simroot = SimulationRoot.Get(PetrelProject.PrimaryProject);

class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Case MyTest;
                CustomCaseRunnerMonitor monit5 = new CustomCaseRunnerMonitor();
                SimulationRoot simroot = SimulationRoot.Get(PetrelProject.PrimaryProject);

                using (ITransaction trans = DataManager.NewTransaction())
                {
                    trans.Lock(simroot);
                    MyTest = simroot.Cases.FirstOrDefault();

                    trans.Commit();
                }
                CaseRunner cRun = SimulationSystem.GetCaseRunner(MyTest);
                cRun.Export();
                cRun.Run(monit5);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message.ToString()); 
            }
            finally
            {
                Console.ReadKey();
            }

        }
    }

    public class CustomCaseRunnerMonitor : CaseRunnerMonitor
    {
        //...
        public override void RunCompleted()
        {
            PetrelLogger.InfoOutputWindow("CustomCaseRunnerMonitor is completed!");
        }

        public override void RunAborted()
        {
            PetrelLogger.InfoOutputWindow("CustomCaseRunnerMonitor is abroted!");
        }

        public override void SimulationProgressChanged(int progress)
        {
            PetrelLogger.InfoOutputWindow("SimulationProgressChanged: " + progress);
        }
    }