Calling MATLAB function from C# Windows Application

I'm trying to learn how to use MATLAB functions from C# with a simple addition function

like this.

function [ sum ] = VisualTest( x,y )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
sum = x + y;
end

I compiled the function into a .NET Assembly using the Library Compiler using this tutotial

Generate a .NET Assembly and Build a .NET Application

I implemented this function into a simple windows form application with Visual Studio 2019, however when I run the Form my result is just "System.Object[]", not an actual value. Is the actual value hidden in this output, or is my function not working properly?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using VisualTestNative;
using System.Runtime.InteropServices;

namespace MatLabTest
{
   
    public partial class Form1 : Form
    {
         
        public Form1()
        {
            InitializeComponent();
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            object Vis;
            object x = Convert.ToDouble(textBox1.Text);
            object y = Convert.ToDouble(textBox2.Text);
            object[] res = null;

            Vis = new Class1();
            Class1 VisRef;
            VisRef = (Class1)Vis;
            res = VisRef.VisualTest(1, x, y);
            Console.WriteLine(res.ToString());

            textBox3.Text = Convert.ToString(res);
        }
    }
}

Answer 1

[Tzu-Hsun Kao]

Maybe you should try to add a reference to your project to the MATLAB COM object.

For example, in Microsoft Visual Studio, open your project. From the Project menu, select Add Reference. Select the COM tab in the Add Reference dialog box. Select the MATLAB application.

Which is pasted from https://www.mathworks.com/help/matlab/matlab_external/call-matlab-function-from-c-client.html