Show thumbnails of XPS documents

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace XPS2Image
{
    public partial class XPSThumbnail : Form
    {
        XpsImage converter = null;
        public XPSThumbnail()
        {
            InitializeComponent();
            converter = new XpsImage();
            this.ClientSize = new Size(411, 300);
        }

        private void buttonBrowse_Click(object sender, EventArgs e)
        {
            openFileDialog.ShowDialog(this);
            textBoxSelectedFile.Text = openFileDialog.FileName;
        }


        private void buttonShowThumbnail_Click(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;
            converter.XpsFileName = openFileDialog.FileName;
            converter.OutputFormat = GetImageFormat();
            converter.OutputQuality = GetImageQuality();
            converter.GenerateThumbnail();
            pictureBox1.Image = Image.FromStream(converter.OutputStream);
            this.ClientSize = new Size(411, 708);
            this.Cursor = Cursors.Arrow;
        }

        private void saveImageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            switch (converter.OutputFormat)
            {
                case OutputFormat.Jpeg:
                    saveThumbnail.Filter = "JPEG (*.jpg)|*.jpg";
                    break;
                case OutputFormat.Png:
                    saveThumbnail.Filter = "PNG (*.png)|*.png";
                    break;
                case OutputFormat.Gif:
                    saveThumbnail.Filter = "GIF (*.gif)|*.gif";
                    break;
                default:
                    saveThumbnail.Filter = "JPEG (*.jpg)|*.jpg";
                    break;
            }
            saveThumbnail.ShowDialog(this);
        }

        private OutputFormat GetImageFormat()
        {
            if (radioButtonJpeg.Checked)
                return OutputFormat.Jpeg;
            else if (radioButtonPng.Checked)
                return OutputFormat.Png;
            else if (radioButtonGif.Checked)
                return OutputFormat.Gif;
            else
                return OutputFormat.Jpeg;
        }

        private OutputQuality GetImageQuality()
        {
            if (radioButtonQualityLow.Checked)
                return OutputQuality.Low;
            else if (radioButtonQualityNormal.Checked)
                return OutputQuality.Normal;
            else if (radioButtonQualityGood.Checked)
                return OutputQuality.Good;
            else if (radioButtonQualitySuper.Checked)
                return OutputQuality.Super;
            else
                return OutputQuality.Normal;
        }

        private void saveThumbnail_FileOk(object sender, CancelEventArgs e)
        {
            FileStream stream = new FileStream(saveThumbnail.FileName, FileMode.Create, FileAccess.Write);
            converter.OutputStream.WriteTo(stream);
            stream.Close();
        }
    }
}