FraukeN

    public class Project : ObservableObject
    {
        private string _title;
        public string Title
        {
            get { return _title; }
            set
            {
                _title = value;
                RaisePropertyChanged(nameof(Title));

FraukeN

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ProjectTimer.Views.TimerPage">
    <StackLayout>
        <Picker ItemsSource="{Binding ProjectNames}"/>
        <Label Text="{Binding Duration}"
               HorizontalOptions="Center"
               FontSize="48"/>
        <Button Text="{Binding ButtonText}" Command="{Binding TimerCommand}"/>
    </StackLayout>

FraukeN

public App()
{
    InitializeComponent();

    MainPage = new TimerPage();
}

FraukeN

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="GoalBuddy.Views.OverviewPage">
    <ListView ItemsSource="{Binding ToDoItems}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextCell Text="{Binding Title}"/>
            </DataTemplate>
        </ListView.ItemTemplate>

FraukeN

    public enum ToDoItemState
    {
        ToDo,
        Done
    }

    public class ToDoItem
    {
        public string Title { get; set; }
        public string Description { get; set; }

FraukeN

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class OverviewPage : ContentPage
    {
        public OverviewPage ()
	{
	    InitializeComponent ();
            BindingContext = new OverviewVM();
	}
    }

FraukeN

    public class OverviewVM
    {
        public List<ToDoItem> ToDoItems { get; set; }

        public OverviewVM()
        {
            ToDoItems = new List<ToDoItem>();
            ToDoItems.Add(new ToDoItem { Title = "Buy cat food", Description = "It's either that or be ambushed and gnawed" });
            ToDoItems.Add(new ToDoItem { Title = "Starch underwear", Description = "It ain't safe if it don't chafe" });
            ToDoItems.Add(new ToDoItem { Title = "Start retro girl band", Description = "Frauke and the courgettes" });

FraukeN

  public App ()
  {
    InitializeComponent();
    MainPage = new OverviewPage();
  }

FraukeN

    public interface IRepository<T>
      where T : class, IEntity, new()
    {
        Task<T> GetAsync(int Id);
        Task<IEnumerable<T>> GetAsync();
        Task<IEnumerable<T>> GetAsync(Expression<Func<T, bool>> predicate);
        Task<IEnumerable<T>> GetAsync(int skip, int take);
        Task<IEnumerable<T>> GetAsync(Expression<Func<T, bool>> predicate, int skip, int take);
        Task<T> FindAsync(Expression<Func<T, bool>> predicate);
        Task<int> AddAsync(T entity);

FraukeN

    public interface IEntity
    {
        int Id { get; set; }
    }