using DevExpress.Xpo;
using System;

namespace SimpleXPOCrud
{
    [OptimisticLocking(true)]
    public class Student : XPLiteObject
    {
        
        public Student(Session session) : base(session)
        {
            session.LockingOption = LockingOption.Optimistic;
        }

        string _code;
        [Key, Persistent("Code")]
        [Size(10)]
        public string Code
        {
            get { return _code; }
            set { SetPropertyValue(nameof(Code), ref _code, value); }
        }

        string _name;   
        [Size(50)]
        public string Name
        {
            get { return _name; }
            set { SetPropertyValue(nameof(Name), ref _name, value); }
        }

        string _address;
        [Size(50)]
        public string Address
        {
            get { return _address; }
            set { SetPropertyValue(nameof(Address), ref _address, value); }
        }

        DateTime _dateOfBirth;       
        public DateTime DateOfBirth
        {
            get { return _dateOfBirth; }
            set { SetPropertyValue(nameof(DateOfBirth), ref _dateOfBirth, value); }
        }

        string _gender;
        [Size(50)]
        public string Gender
        {
            get { return _gender; }
            set { SetPropertyValue(nameof(Gender), ref _gender, value); }
        }


    }

}

using DevExpress.Xpo.DB;
using DevExpress.Xpo;
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 DevExpress.XtraEditors;
using static System.Runtime.CompilerServices.RuntimeHelpers;

namespace SimpleXPOCrud
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            gridView1.FocusedRowChanged += GridView1_FocusedRowChanged;
        }

        private void GridView1_FocusedRowChanged(object sender, DevExpress.XtraGrid.Views.Base.FocusedRowChangedEventArgs e)
        {
            var student = gridView1.GetFocusedRow() as Student;
            if (student != null)
            {
                txtCode.Text = student.Code;
                txtFullName.Text = student.Name;
                txtAddress.Text = student.Address;
                txtDate.EditValue = student.DateOfBirth;
                txtGender.EditValue = student.Gender;
            }
        }

        private XPCollection xpCollection;
        private void Form1_Load(object sender, EventArgs e)
        {
            string connectionString = MSSqlConnectionProvider.GetConnectionString("TMV2209068\\SQLEXPRESS", "sa", "LapTrinhVBNet@2022", "XPOCRUDDemo");
            XpoDefault.DataLayer = XpoDefault.GetDataLayer(connectionString, AutoCreateOption.DatabaseAndSchema);
            LoadData();
        }

        public void LoadData() {
            xpCollection = new XPCollection(typeof(Student));
            gridControl1.DataSource = xpCollection;
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            var dlg = XtraMessageBox.Show($"Do you want <b><color=red>Delete</color></b> student selected?", "Mesasge", MessageBoxButtons.YesNo, MessageBoxIcon.Question, DevExpress.Utils.DefaultBoolean.True);
            if (dlg == DialogResult.Yes)
            {
                using (var uow = new UnitOfWork())
                {
                    var list = gridView1.GetSelectedRows().Select(x => gridView1.GetRow(x) as Student).ToList();

                    var students = uow.Query<Student>().AsEnumerable().Where(s => list.Any(x => s.Code == x.Code)).ToList();
                    uow.Delete(students);
                    uow.CommitChanges();
                    xpCollection.Reload();

                }
            }
               
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            using (var uow = new UnitOfWork())
            {
                var student = new Student(uow);
                student.Code = txtCode.Text;
                student.Name = txtFullName.Text;
                student.DateOfBirth = DateTime.Parse(txtDate.EditValue.ToString());
                student.Address = txtAddress.Text;
                student.Gender = txtGender.Text;

                var isExisted = uow.Query<Student>()
                                .Where(x => x.Code == txtCode.Text).ToList().Count > 0;
                if (isExisted)
                {
                    XtraMessageBox.Show($"Mã sinh viên: {student.Code} này đã tồn tại.");
                    txtCode.Focus();
                    return;
                }

                uow.CommitChanges();
                xpCollection.Reload();
                XtraMessageBox.Show($"Save Successful!", "Message");
            }
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {
            var studentCode = txtCode.Text;

            var dlg = XtraMessageBox.Show($"Do you want update Student: <b><color=red>{txtFullName.Text}</color></b>", "Mesasge", MessageBoxButtons.YesNo, MessageBoxIcon.Question, DevExpress.Utils.DefaultBoolean.True);
            if (dlg == DialogResult.Yes)
            {
                using (var uow = new UnitOfWork())
                {
                    var student = uow.Query<Student>().Where(s => s.Code == studentCode).FirstOrDefault();
                    student.Address = txtAddress.Text;
                    student.Gender = txtGender.Text;
                    student.Name = txtFullName.Text;
                    student.DateOfBirth = DateTime.Parse(txtDate.EditValue.ToString());
                    uow.CommitChanges();
                    xpCollection.Reload();

                }
            }
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            txtCode.Text = "";
            txtFullName.Text = "";
            txtAddress.Text = "";
            txtGender.Text = "";
            txtCode.Focus();
        }
    }
}