using System.ComponentModel;

namespace ClientUI.Samples.Models
{
    public class Contact : INotifyPropertyChanged
    {
        private string _contactName;
        private string _image;
        
        public string ContactName
        {
            get { return this._contactName; }
            set
            {
                if (this._contactName != value)
                {
                    this._contactName = value;
                    this.OnPropertyChanged("ContactName");
                }
            }
        }

        public string Image
        {
            get { return this._image; }
            set
            {
                if (this._image != value)
                {
                    this._image = value;
                    this.OnPropertyChanged("Image");
                }
            }
        }

        protected void OnPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}

using System.Collections.ObjectModel;
using System.ComponentModel;
using ClientUI.Samples.Models;

namespace ClientUI.Samples.ViewModels
{
    public class MainPageViewModel : INotifyPropertyChanged
    {
        public MainPageViewModel()
        {
            this.Data = new ObservableCollection<Contact>();
            this.Data.Add(new Contact() { ContactName = "Anton", Image = "Anton.jpg" });
            this.Data.Add(new Contact() { ContactName = "Brad", Image = "Brad.jpg" });
            this.Data.Add(new Contact() { ContactName = "David", Image = "David.jpg" });
            this.Data.Add(new Contact() { ContactName = "Duke", Image = "Duke.jpg" });
            this.Data.Add(new Contact() { ContactName = "Lisa", Image = "Lisa.jpg" });
        }

        private ObservableCollection<Contact> _data;

        public ObservableCollection<Contact> Data
        {
            get { return this._data; }
            set
            {
                if (this._data != value)
                {
                    this._data = value;
                    this.OnPropertyChanged("Data");
                }
            }
        }

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
}