I am looking for a simple C# example implementing a typesafe interface to a complied MATLAB DLL using R2017b Compiler and VS2017

I used the R2017b MATLAB compiler to build and install built AddMaster.DLL. No problems on this part.

function y = addOne(x)
    y = x + 1;
end

Below is my (weak) attempt a a C# program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
// using System.ServiceModel;
using AddMaster;

namespace LKTypeSafe
{
   public interface IAddOne
    {
        int AddOne(int x);
    }

      class AddOneCls2 : IAddOne
      {
          public int AddOne(int x)
          {
              IAddOne obj = new AddMaster.addOne(int x);
              int two = 0;
              return two = obj.AddOne(x);
          }
      }

      class  AddMaster
      {
          static void Main(string[] args)
          {
              Console.WriteLine("Starting LKTypeSafe");
              AddOneCls obj = null;
              int input = 0;
              try
              {
                  // Instantiate your component class.
                  obj = new AddOneCls2();

                  // Invoke your component.
                 int output = obj.addOne(input);

                  // print the output.
                  Console.WriteLine(output);
                  Console.Write("\nPress any key to exit...");
                  Console.ReadKey(true);
              }
              catch
              {
                  throw;
              }
          }
      }
}

Step by step help on using VS2017 to build this simple example is requested. Any Help is appreciated.