Billing/Billing.Shared/SplashPage.xaml.cs

using Billing.UI;
using Xamarin.Forms;

namespace Billing
{
    public partial class SplashPage : BillingPage
    {
        public SplashPage()
        {
            InitializeComponent();
        }

        public override async void OnLoaded()
        {
            await App.InitilalizeData();

            await Shell.Current.GoToAsync("//Bills");
        }
    }
}