Convert a Windows Form to PDF

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;
using PdfSharp.Pdf;
using PdfSharp.Drawing;

namespace ScreenToPDF
{
    public partial class Form1 : Form
    {
        ScreenCapture capScreen = new ScreenCapture();

        public Form1()
        {
            InitializeComponent();
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void captureScreen()
        {
            try
            {
                // Call the CaptureAndSave method from the ScreenCapture class 
                // And create a temporary file in C:\Temp
                capScreen.CaptureAndSave(@"C:\Temp\test.png", CaptureMode.Window, ImageFormat.Png);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message.ToString());
            }
        }

        private void btnExport_Click(object sender, EventArgs e)
        {
            // Call your captureScreen() function
            captureScreen();

            // Create new pdf document and page
            PdfDocument doc = new PdfDocument();
            PdfPage oPage = new PdfPage();

            // Add the page to the pdf document and add the captured image to it
            doc.Pages.Add(oPage);
            XGraphics xgr = XGraphics.FromPdfPage(oPage);
            XImage img = XImage.FromFile(@"C:\Temp\test.png");
            xgr.DrawImage(img, 0, 0);

            saveFileDialog.Filter = ("PDF File|*.pdf");
            DialogResult btnSave = saveFileDialog.ShowDialog();
            if (btnSave.Equals(DialogResult.OK))
            {
                doc.Save(saveFileDialog.FileName);
                doc.Close();
            }

            // I used the Dispose() function to be able to 
            // save the same form again, in case some values have changed.
            // When I didn't use the function, an GDI+ error occurred.
            img.Dispose();
        }
    }
}