C#, getting wrong value via serial port

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C#

microcontroller

serial-port

, +

What im trying to do, is get string data from my mk by pushing a button on it, but what im gettin on my c# program, its some random numbers(picture is attached).
http://imgur.com/a/79Pbm

What I have tried:

For example i want to receive "5", but i receive "650683" instead of it. On the mk side everything is working, i checked it with Emulator, so the problem is on c# code. Thanks in further.

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 WindowsFormsApplication8 
{
    public partial class Form1 : Form
    {
         public Form1()
         {
              InitializeComponent();
          }

         private void button1_Click(object sender, EventArgs e)   // Here i send a byte to MK
         {
             var dataByte = new byte[] { 0x00 };
             serialPort1.Write(dataByte, 0, 1);
         }

         private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)  // choosing a right com port
        {
            serialPort1.PortName = textBox1.Text;
            serialPort1.BaudRate = Convert.ToInt32(textBox2.Text);

        }
        int rs;
        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) // Data Receive Handler
        {
            try
            {
                rs = serialPort1.ReadByte();
                this.Invoke(new EventHandler(type));
            }
            catch (System.TimeoutException) { }
        }
        void type(object s,EventArgs e)              // receive data
        {
            textBox4.Text += rs.ToString(); 
        }

        private void button3_Click(object sender, EventArgs e)   // OPen port
        {
            serialPort1.Open();
        }

        private void button4_Click(object sender, EventArgs e)  // Close port
        {
            serialPort1.Close();
        }
    }
}