How to scan barcode into textbox by zebra DS3608 - C#

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C#

MySQL

combobox

TextBoxBase

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I'm writing app which can not only generate barcode from combobox but will scan barcode into textbox. Generating barcode is working well but is a little worse with scanning it by Device Zebra DS3608. In this project I added a library:

using USB_Barcode_Scanner;

And then I added and modified in public method:

public PrintLabel()
        {
        InitializeComponent();
        BarcodeScanner barcodeScanner = new BarcodeScanner(textBox1);
        barcodeScanner.BarcodeScanned += BarcodeScanner_BarcodeScanned;
        Fillcombox();
        }

And new method was automatically generated.

private void BarcodeScanner_BarcodeScanned(object sender, BarcodeScannerEventArgs e)
        {
            textBox1.Text = e.Barcode;
        }

After this modification it compiled correctly but after launching it instead focusing on textbox I try to scan but it begins from button and scans into combobox.
How can i change it? Does it belong from this barcode scanner settings or this code? Maybe below code helps:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Printing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using Zen.Barcode;
using USB_Barcode_Scanner;

namespace IT_equipment_program
{
    public partial class PrintLabel : Form
    {
        MySqlConnection connection;
        MySqlCommand command;
        MySqlDataReader dr;
        public PrintLabel()
        {
            InitializeComponent();
            textBox1.Focus();
            BarcodeScanner barcodeScanner = new BarcodeScanner(textBox1);
            barcodeScanner.BarcodeScanned += BarcodeScanner_BarcodeScanned;
            Fillcombox();
        }

        private void BarcodeScanner_BarcodeScanned(object sender, BarcodeScannerEventArgs e)
        {
            textBox1.Text = e.Barcode;
        }

        void Fillcombox()
        {
            try
            {
                string con = "server=127.0.0.1;port=3306;Database=et_system_pl;uid=root;pwd=;CharSet=utf8mb4;";
                MySqlConnection SelectConnection = new MySqlConnection(con);

                string Selectquery = "SELECT DISTINCT Equipment FROM equipments";
                MySqlCommand com = new MySqlCommand(Selectquery, SelectConnection);
                SelectConnection.Open();

                MySqlDataReader dr = com.ExecuteReader();

                while (dr.Read())
                {
                    cmb_Equip.Items.Add(dr.GetString("Equipment"));
                }

                SelectConnection.Close();
            }

            catch
            {
                MessageBox.Show("please check internet connection.");
            }
        }

        void Fillcombox2()
        {
          try
          {
            string conn2 = "server=127.0.0.1;port=3306;Database=et_system_pl;uid=root;pwd=;CharSet=utf8mb4;";
            string query2 = "SELECT IT_Equipments_No FROM equipments WHERE Equipment = @EQUIP";

            using (connection = new MySqlConnection(conn2))
            {
                using (command = new MySqlCommand(query2, connection))
                {
                    command.Parameters.AddWithValue("@EQUIP", cmb_Equip.Text);
                    connection.Open();

                    command.ExecuteNonQuery();
                    dr = command.ExecuteReader();
                    while (dr.Read())
                    {
                        cmb_IT_Equip_NO.Items.Add(dr.GetString("IT_Equipments_No"));
                    }
                    connection.Close();
                }
            }
          }

          catch
          {
              MessageBox.Show("Please check internet connection.");
          }
        }

        private void btn_exit_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void cmb_Equip_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                string conn3 = "server=127.0.0.1;port=3306;Database=et_system_pl;uid=root;pwd=;CharSet=utf8mb4;";
                string query3 = "SELECT Equipment FROM equipments WHERE Equipment = @EQUIP";

                using (connection = new MySqlConnection(conn3))
                {
                    using (command = new MySqlCommand(query3, connection))
                    {
                        command.Parameters.AddWithValue("@EQUIP", cmb_Equip.Text);
                        connection.Open();

                        command.ExecuteNonQuery();
                        dr = command.ExecuteReader();
                        while (dr.Read())
                        {
                            string name = (string)dr["Equipment"].ToString();
                            txt_equip.Text = name;
                            cmb_IT_Equip_NO.SelectedIndex = -1;
                        }
                        cmb_IT_Equip_NO.Enabled = true;
                        cmb_IT_Equip_NO.Items.Clear();
                        Fillcombox2();
                        connection.Close();
                    }
                }
            }

            catch
            {
                MessageBox.Show("Please check internet connection.");
            }
        }

        private void cmb_IT_Equip_NO_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                string conn4 = "server=127.0.0.1;port=3306;Database=et_system_pl;uid=root;pwd=;CharSet=utf8mb4;";
                string query4 = "SELECT IT_Equipments_No FROM equipments WHERE IT_Equipments_No = @EQUIP_NO";

                using (connection = new MySqlConnection(conn4))
                {
                    using (command = new MySqlCommand(query4, connection))
                    {
                        command.Parameters.AddWithValue("@EQUIP_NO", cmb_IT_Equip_NO.Text);
                        connection.Open();

                        command.ExecuteNonQuery();
                        dr = command.ExecuteReader();
                        while (dr.Read())
                        {
                            string number = (string)dr["IT_Equipments_No"].ToString();
                            txt_IT_NO.Text = number;
                        }
                        btn_generate.Enabled = true;
                        connection.Close();
                    }
                }
            }

            catch
            {
                MessageBox.Show("Please check internet connection.");
            }
        }

        private void btn_init_Click(object sender, EventArgs e)
        {
            cmb_IT_Equip_NO.SelectedIndex = -1;
            cmb_Equip.SelectedIndex = -1;
            cmb_IT_Equip_NO.Items.Clear();
            cmb_Equip.Items.Clear();

            btn_Print.Enabled = false;
            btn_generate.Enabled = false;
            cmb_IT_Equip_NO.Enabled = false;

            txt_equip.Text = string.Empty;
            txt_IT_NO.Text = string.Empty;
            Fillcombox();
        }

        private void btn_generate_Click(object sender, EventArgs e)
        {
            Code128BarcodeDraw Barcode = BarcodeDrawFactory.Code128WithChecksum;
            pictureBox1.Image = Barcode.Draw(txt_IT_NO.Text, 50);
            btn_Print.Enabled = true;
        }

        private void btn_Print_Click(object sender, EventArgs e)
        {
            PrintDialog pd = new PrintDialog();
            PrintDocument pDoc = new PrintDocument();
            pDoc.PrintPage += PrintPicture;
            pd.Document = pDoc;
            if (pd.ShowDialog() == DialogResult.OK)
            {
                pDoc.Print();
            }
        }

        private void PrintPicture(object sender, PrintPageEventArgs e)
        {
            Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            pictureBox1.DrawToBitmap(bmp, new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
            e.Graphics.DrawImage(bmp, 0, 0);
            bmp.Dispose();
        }
    }
}

What I have tried:

I've tried eventually by changing in public method:

public PrintLabel()
        {
        InitializeComponent();
        textBox1.Focus();
        BarcodeScanner barcodeScanner = new BarcodeScanner(textBox1);
        barcodeScanner.BarcodeScanned += BarcodeScanner_BarcodeScanned;
        Fillcombox();
        }

But it didn't help