WPF C# Tutorial

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="BitmapProgramming" Height="300" Width="300"
    >

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace BitmapProgramming
{
    public partial class UseBitmapImage : System.Windows.Window
    {
        public UseBitmapImage()
        {
            InitializeComponent();
            Image imageElement = new Image();
            imageElement.Source = new BitmapImage(new Uri("http://www.your host.com/a.jpg"));
            this.Content = imageElement;
        }
    }
}