How to transfer data from a program written in C# (SerialPort) to Matlab?

Question

C++ / C#

Good evening! I ask for your help. It's worth saying in advance that I'm new to this business. I have the task of transferring data from a program written in C# to Matlab. In a C# program, I form an infinite loop that passes data. And in Matlab I created a Simulink model. I checked the performance of each program separately (I just put a jumper between the RX TX ports). For each program I have a separate UART. When I run the program to transfer data, the LEDs on each of the UARTs are lit during data transfer (I think this is a sign of data on the Rx / Tx ports). However, in Matlab I can't display anything.

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 System.IO.Ports;
 
namespace WindowsFormsApp5
{
    public partial class Form1 : Form
    {
        SerialPort port = new SerialPort("COM7", 115200, Parity.None, 8, StopBits.One);    
        public Form1()
        {
            InitializeComponent();
            if (port != null)
            {                               
                port.Open();             
                byte number = 15;
                while(1<2)
                {
                    port.Write(new byte[] { number }, 0, 1);
                }
            }
            
        }
    }
 
}

As a result of running the model in Matlab, I get nothing. I ask you for help. Below is the model with block parameters.