HomeController1.cs

public class HomeController : Controller
{
    private readonly ICustomerService customerSvc;

    public HomeController(ICustomerService customerService)
    {
        this.customerSvc = customerService;
    }

    public IActionResult Index()
    {
        List customersForTenant = new List();
        var customers = this.customerSvc.GetAllCustomers();        

        // ... return results
    }
}