public async void ButtonAdd (string name, string price, string order)
{
    await using var dbContext = new BurgerContext();
                await dbContext.Database.EnsureCreatedAsync();
                Order newOrder = new();

                if (!string.IsNullOrEmpty(name) && !string.IsNullOrEmpty(price)
                    && !string.IsNullOrEmpty(order))
                {
                    await dbContext.Orders.AddAsync(
                     order =  new Order() { Description = order });
                    await dbContext.Burgers.AddAsync(
                        new Burger() {Name = name, Price = Convert.ToDouble(price), Order = newOrder});

                    await dbContext.SaveChangesAsync();

                    MessageBox.Show("Data is saved", "INFO", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show("Something went wrong", "INFO", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
}