ADO.NET Sql Connection ve Grid View

public List<Product> GetAll()
{
    SqlConnection con = new SqlConnection
    (@"Server=.\sqlexpress; Initial Catalog=ETrade; User Id=sa; Password=***;");
 
    if (con.State==ConnectionState.Closed)
    {
        con.Open();
    }
 
    SqlCommand sqlCommand = new SqlCommand("SELECT * FROM Products", con);        
 
    SqlDataReader sqlDataReader= sqlCommand.ExecuteReader();
 
    List<Product> products = new List<Product>();
 
    while (sqlDataReader.Read())
    {
        Product product = new Product()
        {
            Id = (Int32)sqlDataReader["Id"],
            Name = sqlDataReader["Name"].ToString(),
            UnitPrice = (decimal)sqlDataReader["UnitPrice"],
            StockAmount = (Int32)sqlDataReader["StockAmount"],
 
 
        };
 
        products.Add(product);
 
    }
 
    return products;
 
}

From Form

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
 
    private void Form1_Load(object sender, EventArgs e)
    {
        IProductDal productDal = new ProductDal();
 
        dgwProduct.DataSource=productDal.GetAll();
 
    }
}