How do I top the UI from freezing even when I'm using a backgroundworker ?

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C#

BackgroundWorker

Hi everyone !!

I have a problem using the backgroundworker thing. Simply put i try to show random images and a little clock telling since when the app i running. The problem start when I try to add some socket code to send a certain value to clients sockets.
It just takes too long and during that time, my UI freezes for approximatively one minute or so. I read and some people told me to try using a backgroundworker.
I don't get where I'm doing something bad but nothing really changed. My app still freezes and for the same amount of time. Here is my code. Is anyone seeing the problem ? What and here am I doing wrong ? Thanks a lot !!

What I have tried:

using Npgsql;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ImageRandomizeforSenseIt
{
    public partial class ImageRandomize : Form
    {
        // How to deal with form moving without controlbox
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();
        // End How to deal with form moving without controlbox 
        
        // Declarations & Initialisations
        //string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms", t.Hours, t.Minutes, t.Seconds, t.Milliseconds);
        public int duration = 0;

        public List List_Hours_To_Check = new List { };
        public int NextIndex = -1;
        public int affiche = 0;
        
        /*    debut zone socket     */
            TcpListener ServerSocket = new TcpListener(System.Net.IPAddress.Any, 8888) ;
            int requestCount = 0;
            TcpClient ClientSocket = default(TcpClient);
        /*    fin zone socket     */

        /**/
            BackgroundWorker bw = new BackgroundWorker();
        /**/

        public ImageRandomize()
        {
            InitializeComponent();
            this.BackColor = Color.FromArgb(57, 57, 60);

            var start = DateTime.Today;
            var nbparjour = (24 * 60) / ImageRandomizeforSenseIt.Properties.Settings.Default.DelaiChangementEnMn;
            var clockQuery = from offset in Enumerable.Range(0, nbparjour)
                             select start.AddMinutes(ImageRandomizeforSenseIt.Properties.Settings.Default.DelaiChangementEnMn * offset);
            foreach (var time in clockQuery)
                List_Hours_To_Check.Add(time.ToString("HH:mm"));

            LabelTotal.Text = "XX : XX";

            /**/
                //bw.DoWork += Bw_DoWork;
            // To report progress from the background worker we need to set this property
            bw.WorkerReportsProgress = false;
            // This event will be raised on the worker thread when the worker starts
            bw.DoWork += new DoWorkEventHandler(Bw_DoWork);
            /**/

            ServerSocket.Start();
        }

        //Do your Background-Work
        private void Bw_DoWork(object sender, DoWorkEventArgs e)
        {
            //string[] param = e.Argument as string[];
            string ee;
 
            //Process your long running  task
            try
            {
                if (ServerSocket.Pending() == true)
                {
                    ClientSocket = ServerSocket.AcceptTcpClient();
                    requestCount = requestCount + 1;

                    NetworkStream networkStream = ClientSocket.GetStream();

                    byte[] bytesFrom = new byte[(int)ClientSocket.ReceiveBufferSize];
                    networkStream.Read(bytesFrom, 0, (int)ClientSocket.ReceiveBufferSize);

                    string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

                    string serverResponse = List_Hours_To_Check[NextIndex];
                    Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);

                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();

                    ClientSocket.Close();
                }
            }
            catch (InvalidOperationException ex)
            {
                ee = ex.Message; 
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (SocketException ex)
            {
                ee = ex.Message;
            }
            catch (Exception ex)
            {
                ee = ex.Message;
            }

            //e.Result = null; //Set your Result of the long running task
        }

        private void Send_Something_Complete()
        {
            try
            {
                if (ServerSocket.Pending() == true)
                {
                    ClientSocket = ServerSocket.AcceptTcpClient();
                    requestCount = requestCount + 1;

                    NetworkStream networkStream = ClientSocket.GetStream();

                    byte[] bytesFrom = new byte[(int)ClientSocket.ReceiveBufferSize];
                    networkStream.Read(bytesFrom, 0, (int)ClientSocket.ReceiveBufferSize);

                    string dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                    dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

                    string serverResponse = List_Hours_To_Check[NextIndex];
                    Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);

                    networkStream.Write(sendBytes, 0, sendBytes.Length);
                    networkStream.Flush();

                    ClientSocket.Close();
                }
            }
            catch (InvalidOperationException ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (SocketException ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (Exception ex)
            {
                //MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        
        private void Timer_Duration_Tick(object sender, EventArgs e)
        {            
            duration = duration + Timer_Duration.Interval;
            //TimeSpan t = TimeSpan.FromMilliseconds(duration);
            //LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}",t.Hours, t.Minutes, t.Seconds);

            TimeSpan t = TimeSpan.FromMilliseconds(duration);
            LabelDuration.Text = string.Format("{0:D2} : {1:D2} : {2:D2}",
                                                    t.Hours,
                                                    t.Minutes,
                                                    t.Seconds);

            var TM = DateTime.Now.ToString("HH:mm");

            if ((((List_Hours_To_Check.FindIndex(x => x == TM) != -1))
                || ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image == null)))
                && (affiche == 0))
            {
                NextIndex = List_Hours_To_Check.FindIndex(x => x == TM) + 1;
                affiche = 1;
                Module.Current_Image_To_Be_Annotated_Path = Module.Get_Random_Image_To_Be_Annotated_Path();
                Module.Auto_Size_Image(Image.FromFile(Module.Current_Image_To_Be_Annotated_Path), picToZoom, PictureBoxSizeMode.Zoom);
                //SaveImage();
            }
            else if ((List_Hours_To_Check.FindIndex(x => x == TM) == -1) && (picToZoom.Image != null))
            {
                Boolean NextFound = false;
                affiche = 0;
                while (NextFound == false)
                {
                    var TN = DateTime.Now.AddMinutes(1).ToString("HH:mm");

                    if (List_Hours_To_Check.FindIndex(x => x == TN) != -1)
                    {
                        NextFound = true;
                        NextIndex = List_Hours_To_Check.FindIndex(x => x == TN);
                    }
                    else
                    {
                        NextFound = false;
                    }
                }
            }

            LabelTotal.Text = List_Hours_To_Check[NextIndex];
            
            //Send_Something_Complete(); 
        }

        private void SaveImage()
        {
            // Save the selected image
            string Query_S = String.Empty;
            List listevaleurs = new List { };

            Query_S =
            "INSERT INTO image_affichee (image_en_cours, heure_image_suivante) " +
                "values (@a, @b);";

            listevaleurs.Add(Module.Current_Image_To_Be_Annotated_Path);
            listevaleurs.Add(LabelTotal.Text);

            NpgsqlConnection Connection = Module.Connexion();
            NpgsqlTransaction Transaction;

            Connection.Open(); if (!(Connection.State == ConnectionState.Open)) { Connection.Open(); }

            Transaction = Connection.BeginTransaction();
            NpgsqlCommand MaCommande = new NpgsqlCommand(Query_S, Connection, Transaction);

            try
            {
                MaCommande.Parameters.Add("@a", listevaleurs[0]);
                MaCommande.Parameters.Add("@b", listevaleurs[1]);
                MaCommande.ExecuteNonQuery();

                Transaction.Commit();
            }
            catch (NpgsqlException ex)
            {
                MessageBox.Show(("Error " + (ex.ErrorSql + (" has occurred: " + ex.Message))), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Transaction.Rollback();
            }

            if ((Transaction == null)) { Connection.Close(); }
        }        
                
        private void ImageRandomize_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }
        
        private void ImageRandomize_Load(object sender, EventArgs e)
        {
            // Adding the events to Form
            this.MouseDown += ImageRandomize_MouseDown;

            Timer_Duration.Start();
        }
        
        private void ImageRandomize_DoubleClick(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized; 
        }

        private void ImageRandomize_FormClosing(object sender, FormClosingEventArgs e)
        {
            ServerSocket.Stop();
        }

        private void ImageRandomize_Shown(object sender, EventArgs e)
        {
            bw.RunWorkerAsync();
        }
        
    }
}