MainPage.xaml.cs

using XamarinFirebase.Helper;  
using XamarinFirebase.Model;  
  
namespace XamarinFirebase  
{  
    public partial class MainPage : ContentPage  
    {  
        FirebaseHelper firebaseHelper = new FirebaseHelper();  
        public MainPage()  
        {  
            InitializeComponent();  
        }  
  
        protected async override void OnAppearing()  
        {  
  
            base.OnAppearing();  
            var allPersons = await firebaseHelper.GetAllPersons();  
            lstPersons.ItemsSource = allPersons;  
        }  
  
        private async void BtnAdd_Clicked(object sender, EventArgs e)  
        {  
            await firebaseHelper.AddPerson(Convert.ToInt32(txtId.Text), txtName.Text);  
            txtId.Text = string.Empty;  
            txtName.Text = string.Empty;  
            await DisplayAlert("Success", "Person Added Successfully", "OK");  
            var allPersons = await firebaseHelper.GetAllPersons();  
            lstPersons.ItemsSource = allPersons;  
        }  
  
        private async void BtnRetrive_Clicked(object sender, EventArgs e)  
        {  
            var person = await firebaseHelper.GetPerson(Convert.ToInt32(txtId.Text));  
            if(person!=null)  
            {  
                txtId.Text = person.PersonId.ToString();  
                txtName.Text = person.Name;  
                await DisplayAlert("Success", "Person Retrive Successfully", "OK");  
                  
            }  
            else  
            {  
                await DisplayAlert("Success", "No Person Available", "OK");  
            }  
              
        }  
  
        private async void BtnUpdate_Clicked(object sender, EventArgs e)  
        {  
            await firebaseHelper.UpdatePerson(Convert.ToInt32(txtId.Text), txtName.Text);  
            txtId.Text = string.Empty;  
            txtName.Text = string.Empty;  
            await DisplayAlert("Success", "Person Updated Successfully", "OK");  
            var allPersons = await firebaseHelper.GetAllPersons();  
            lstPersons.ItemsSource = allPersons;  
        }  
  
        private async void BtnDelete_Clicked(object sender, EventArgs e)  
        {  
            await firebaseHelper.DeletePerson(Convert.ToInt32(txtId.Text));  
            await DisplayAlert("Success", "Person Deleted Successfully", "OK");  
            var allPersons = await firebaseHelper.GetAllPersons();  
            lstPersons.ItemsSource = allPersons;  
        }  
    }  
}