private void loginButton_Click(object sender, EventArgs e)
        {
            string userName = usernameTextBox.Text.ToString();
            string password = passwordTextBox.Text.ToString();

            int successSwitch = 0;

            using (MySqlConnection mySqlCon = new MySqlConnection(connectionString))
            {
                mySqlCon.Open();
                MySqlCommand cmd = new MySqlCommand("SELECT U04pXF.user.userName," +
                                                    " U04pXF.user.password FROM U04pXF.user", mySqlCon);
                MySqlDataAdapter mySqlDA = new MySqlDataAdapter(cmd);

                DataTable dtbl = new DataTable();
                mySqlDA.Fill(dtbl);

                foreach (DataRow dr in dtbl.Rows)
                {
                    string userFetched     = dr["userName"].ToString();
                    string passwordFetched = dr["password"].ToString();

                    if (userName == userFetched && password == passwordFetched)
                    {
                        successSwitch = 1;
                        CurrentUser   = userFetched;
                        DateTime x = new DateTime();
                        x         = DateTime.Now;
                        LoginTime = x.ToString();
                        LogEntry();
                    }
                }
            }

            if (successSwitch == 1)
            {
                MainScreen mainScreen = new MainScreen();
                mainScreen.Show();
                this.Hide();
            }
            else
            {
                errorLabel.Visible = true;
            }
        }