using (MySqlConnection con = new MySqlConnection(strCon))
{
con.Open();
sql = "select cart.*,product.Pro_Name,brand.Bnd_Name from cart,product,brand where Crt_Pro_Id = Pro_Id and Pro_Bnd_Id = Bnd_Id and Crt_Cus_Id = " + cusid;
da = new MySqlDataAdapter(sql, con);
dtCart = new DataTable();
da.Fill(dtCart);
con.Close();
}