eksam/Päevaküsimus/NotificationBase.cs

using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Päevaküsimus
{
    [Serializable()]
    public class NotificationBase : INotifyPropertyChanged

    {
        [field: NonSerialized()]
        public event PropertyChangedEventHandler PropertyChanged;

        // This method is called by the Set accessor of each property.
        // The CallerMemberName attribute that is applied to the optional propertyName
        // parameter causes the property name of the caller to be substituted as an argument.
        public void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}