WPF C#

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="FlowDocReader Load/Save Sample" Width="640" Height="480">
  
    
  


//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Forms;
using System.IO;
using System.Windows.Markup;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            SaveFileDialog saveFile = new SaveFileDialog();
            FileStream xamlFile = null;
            saveFile.Filter = "FlowDocument Files (*.xaml)|*.xaml|All Files (*.*)|*.*";
            if (saveFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                try
                {
                    xamlFile = saveFile.OpenFile() as FileStream;
                }
                catch (Exception e)
                {
                    String error = "There was a opening the file:\n\n";
                    error += saveFile.FileName;
                    error += "\n\nException details:\n\n";
                    error += e.Message;
                    System.Windows.MessageBox.Show(error);
                    return;
                }
                if (xamlFile == null) return;
                else
                {
                    XamlWriter.Save(FlowDocRdr.Document, xamlFile);
                    xamlFile.Close();
                }
            }
        }
    }
}