Biskilog/BISKILOG POS PREMIUM/Delivery/DriverAssignment.cs

using BiskLog_Point_Of_Sale.Classes;
using BiskLog_Point_Of_Sale.Multiple_Login;
using BiskLog_Point_Of_Sale.Properties;
using Point_Of_Sale_Managment;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BiskLog_Point_Of_Sale.Delivery
{
    public partial class DriverAssignment : Form
    {
        SqlConnection cn;
        SqlCommand cm;
        SqlDataReader dr;
        DatabaseConn conn = new DatabaseConn();
        string truck;
        public DriverAssignment(string truck)
        {
            InitializeComponent();
            cn = new SqlConnection(conn.MyConnection());
            this.truck = truck;
        }
        public int loadDrivers()
        {
            try
            {
                cn.Open();
                cm = new SqlCommand("Select driverID,firstname,surname from tblDrivers where branchID = @branchID and status = 'UNASSIGNED'", cn);
                cm.Parameters.AddWithValue("@branchID", Settings.Default.BranchID);
                cm.ExecuteNonQuery();
                dr = cm.ExecuteReader();
                while (dr.Read())
                {
                    ComboboxItem combobox = new ComboboxItem();
                    combobox.Text = dr[1].ToString().ToUpper() + " " + dr[2].ToString().ToUpper();
                    combobox.Value = dr[0].ToString();
                    truckDrivers.Invoke(new Action(() => truckDrivers.Items.Add(combobox)));
                }
                dr.Close();
                cn.Close();
                return 1;
            }
            catch (Exception ex)
            {
                cn.Close();
                ErrorLogging.WriteToFile(ex.ToString());
                return 0;
            }
        }

        private async void DriverAssignment_Load(object sender, EventArgs e)
        {
            Task<int> task = new Task<int>(loadDrivers);
            task.Start();
            await task;
        }
        public int assignDriver(string truck, string driver)
        {
            cn.Open();
            SqlTransaction transaction;
            transaction = cn.BeginTransaction();
            try
            {
                cm = new SqlCommand("Update tblDrivers set status = @status where driverID = @driverID and branchID = @branchID", cn, transaction);
                cm.Parameters.AddWithValue("@status", "ASSIGNED");
                cm.Parameters.AddWithValue("@branchID", Settings.Default.BranchID);
                cm.Parameters.AddWithValue("@driverID", driver);
                cm.ExecuteNonQuery();

                cm = new SqlCommand("Update tblTrucks set driver = @driver where truckID = @truckID and branchID = @branchID", cn, transaction);
                cm.Parameters.AddWithValue("@truckID", truck);
                cm.Parameters.AddWithValue("@branchID", Settings.Default.BranchID);
                cm.Parameters.AddWithValue("@driver", driver);
                cm.ExecuteNonQuery();

                cm = new SqlCommand("Insert into tblTruck_DriverMapping (truckID,driverID,dateEntry,operation,countID) values " +
                            "(@truckID,@driverID,@dateEntry,@operation,@countID)", cn, transaction);
                cm.Parameters.AddWithValue("@truckID", truck);
                cm.Parameters.AddWithValue("@driverID", driver);
                cm.Parameters.AddWithValue("@dateEntry", DateTime.Now);
                cm.Parameters.AddWithValue("@operation", "DRIVER ASSIGNED TO TRUCK");
                cm.Parameters.AddWithValue("@countID", DateTime.Now.ToString("yyyyMMddHHmmssfff"));
                cm.ExecuteNonQuery();
                transaction.Commit();
                cn.Close();
                return 1;
            }
            catch (Exception ex)
            {
                transaction.Rollback();
                cn.Close();
                ErrorLogging.WriteToFile(ex.ToString());
                return 0;
            }
        }
        private async void btnAdd_Click(object sender, EventArgs e)
        {
            string truckDriver = (truckDrivers.SelectedItem as ComboboxItem).Value.ToString();
            Task<int> task = new Task<int>(() => assignDriver(truck, truckDriver));
            holding.Visible = true;
            task.Start();
            int result = await task;
            if (result == 1)
            {
                string title = "Success";
                string message = "New driver assigned successfully";
                NoAction noaction = new NoAction(title, message);
                noaction.BringToFront();
                noaction.ShowDialog();
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            else
            {
                string title = "Error occurred";
                string message = "An error occurred while assigning driver to truck";
                NoAction noaction = new NoAction(title, message);
                noaction.BringToFront();
                noaction.ShowDialog();
            }
            holding.Visible = false;
        }

        private void exit_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.Cancel;
            this.Close();
        }

        private void exit_MouseEnter(object sender, EventArgs e)
        {
            exit.BackColor = Color.Crimson;
        }

        private void exit_MouseLeave(object sender, EventArgs e)
        {
            exit.BackColor = Color.FromArgb(20, 158, 137);
        }
    }
}