MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace WpfApplication2 {

    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }

        public List<Agent> Agents { get { return WpfApplication2.Agents.DataSource; } }
    }

    public class Agent {
        public string AgentName { get; set; }
        public string Phone { get; set; }
        public string Photo { get; set; }
        public ImageSource PhotoSource {
            get {
                return string.IsNullOrEmpty(Photo) ? null : new BitmapImage(new Uri(Photo, UriKind.Relative));
            }
        }
    }

    public static class Agents {
        public static readonly List<Agent> DataSource =
            new List<Agent> {
                new Agent { AgentName = "Anthony Peterson", Phone = "(555) 444-0782", Photo = "Images/1.jpg" },
                new Agent { AgentName = "Rachel Scott", Phone = "(555) 249-1614", Photo = "Images/2.jpg" },
                new Agent { AgentName = "Albert Walker", Phone = "(555) 232-2303", Photo = "Images/3.jpg" }
            };
    }
}