how to viewmodel with services in mvc

Question

hI,

I have a application where I need to display the products using view model and service layer but I dont know how to connect both

public class Product
{
    public int ID { get; set; }
    public string Prod_SKU { get; set; }
    public string Prod_Name { get; set; }
    public double Price { get; set; }
}
public class ProductService : IProductService
{
    private ProductContext _context; public ProductService(ProductContext context)
    {
        _context = context;
    }
    public IEnumerable<Product> GetAll()
    {
        return _context.Products.ToList();
    }
}

product view model

public class ProductViewModel
{
    public int ProductId { get; set; }
    public string ProductSku { get; set; }
    public string ProductName { get; set; }
    public double ProductPrice { get; set; }
    public List<Product> Products { get; set; }
}

now in action I have written like this

private IProductService _productService;
private ProductViewModel _productViewModel;
public ProductController(IProductService productService, ProductViewModel productViewModel)
{
    _productService = productService;
    _productViewModel = productViewModel;
}
// GET: Product
public ActionResult Index()
{
    _productService.GetAll();
    return View(_productService.GetAll());
}
}

now I want to connect all my viewmodel with service class but dono how can u give some help on using extension methods in thsi example