using System;

using System.ComponentModel;

using System.Runtime.CompilerServices;

public class Program

{

    public static void Main()

    {

        DemoCustomer demo  = new DemoCustomer();

        demo.PropertyChanged += DemoCustomer_PropertyChanged1;

        demo.PropertyChanged += DemoCustomer_PropertyChanged2;

​

        demo.CustomerName = "Whit";

        demo.PhoneNumber = "555-555-5555";

​

​

        // this method will kick off when NotifyPropertyChanged is invoked.  We can 

        // perform what ever logic needs doing after a prop change here

​

        void DemoCustomer_PropertyChanged1(object? sender, PropertyChangedEventArgs e)

        {

            Console.WriteLine("Logic for event handler 1");

        }

​

​

        // we can also create another method that subscribes to our event.

        // this can help us promote loose coupling

        void DemoCustomer_PropertyChanged2(object? sender, PropertyChangedEventArgs e)

        {

            Console.WriteLine("Logic for event handler 2");

        }

    }

}

​

public class DemoCustomer : INotifyPropertyChanged

{

    private string customerNameValue = string.Empty;

    private string phoneNumberValue = string.Empty;

​

    // the event handler we can use to perform our actions when a property changes

    public event PropertyChangedEventHandler PropertyChanged;

    // callling this method will trigger the event handler

    private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")

    {

        if (PropertyChanged != null)

        {

            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

        }

    }

​

    public DemoCustomer()

    {

        customerNameValue = "Customer";

        phoneNumberValue = "(312)555-0100";

    }

​

    public string CustomerName

    {

        get

        {

            return this.customerNameValue;

        }

​

        set

        {

            if (value != this.customerNameValue)

            {

                this.customerNameValue = value;

                NotifyPropertyChanged();

            }

        }

    }

​

    public string PhoneNumber

    {

        get

        {

            return this.phoneNumberValue;

        }

​

        set

        {

            if (value != this.phoneNumberValue)

            {

                this.phoneNumberValue = value;

                NotifyPropertyChanged();

            }

        }

    }

}