WPF C#

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="600" Width="800">
  
    
      
        
        
      
      
    
  


//File:Window.xaml.cs
using System;
using System.IO;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Markup;
using System.Windows.Xps.Packaging;
using System.Xml;
using Microsoft.Win32;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void btnOpenFlowDoc_Click(object sender, RoutedEventArgs e)
        {
            Stream file = file = File.OpenRead("c:\\b.xps");
            TextReader reader = new StreamReader(file);
            XmlTextReader xmlReader = new XmlTextReader(reader);
            FlowDocument flowDocument = XamlReader.Load(xmlReader) as FlowDocument;
            dvDocumentViewer.Document = flowDocument;
        }
    }
}