Entity Framework Basic CRUD

EFBasicCrud.cs

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;

namespace EntityFramework_demo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        ProductDal _productDal = new ProductDal();
        private void Form1_Load(object sender, EventArgs e)
        {
            dgw_items.DataSource = _productDal.GetAll();

        }

        private void btn_AddProduct_Click(object sender, EventArgs e)
        {
            _productDal.Add(new Product
            {
                Name = tbxName.Text,
                UnitPrice = Convert.ToDecimal(tbxUnitPrice.Text),
                StockAmount = Convert.ToInt32(tbxStockAmount.Text)
            });
            dgw_items.DataSource = _productDal.GetAll();
            MessageBox.Show("Add Product");
        }

        private void btn_Update_Click(object sender, EventArgs e)
        {
            _productDal.Update(new Product
            {
                Id =Convert.ToInt32(dgw_items.CurrentRow.Cells[0].Value),
                Name = tbx_Name_Update.Text,
                UnitPrice = Convert.ToDecimal(tbx_UnitPrice_Update.Text),
                StockAmount = Convert.ToInt32(tbx_StockAmount_Update.Text)
            });
            dgw_items.DataSource = _productDal.GetAll();
            MessageBox.Show("Update Product");
        }
       private void btn_delete_product_Click(object sender, EventArgs e)
        {
            _productDal.Delete(new Product
            {
                Id = Convert.ToInt32(dgw_items.CurrentRow.Cells[0].Value),
                
            });
            dgw_items.DataSource = _productDal.GetAll();
            MessageBox.Show("Delete Product");
        }
        private void dgw_items_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            tbx_Name_Update.Text = dgw_items.CurrentRow.Cells[1].Value.ToString();
            tbx_UnitPrice_Update.Text = dgw_items.CurrentRow.Cells[2].Value.ToString();
            tbx_StockAmount_Update.Text = dgw_items.CurrentRow.Cells[3].Value.ToString();
        }
    }
}

Product.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EntityFramework_demo
{
   public class Product
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public decimal UnitPrice { get; set; }
        public int StockAmount { get; set; }
    }
}

ProductDal.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.Entity;
namespace EntityFramework_demo
{
    public class ProductDal
    {
        public List<Product> GetAll()
        {
            using (ETradeContext context = new ETradeContext())
            {
                return context.Products.ToList();
            }
        }
        public void Add(Product product)
        {
            using (ETradeContext context = new ETradeContext())
            {
                context.Products.Add(product);
                context.SaveChanges(); 
            }

        }
        public void Update(Product product)
        {
            using (ETradeContext context = new ETradeContext())
            {
                var entity = context.Entry(product);
                entity.State = EntityState.Modified;
                context.SaveChanges();
            }

        }
        public void Delete(Product product)
        {
            using (ETradeContext context = new ETradeContext())
            {
                var entity = context.Entry(product);
                entity.State = EntityState.Deleted;
                context.SaveChanges();
            }

        }
    }
}