如何在Windows窗体上显示office或pdf内容？

private void LoadOfficeDocument(string filePath)
{
    object missing = Type.Missing;
    object readOnly = true;
    object isVisible = false;

    Microsoft.Office.Interop.Word.Application wordApp = new Microsoft.Office.Interop.Word.Application();
    Microsoft.Office.Interop.Word.Document wordDoc = wordApp.Documents.Open(ref filePath, ref missing, ref readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref isVisible, ref missing, ref missing, ref missing);

    wordDoc.ActiveWindow.Selection.WholeStory();
    wordDoc.ActiveWindow.Selection.Copy();

    webBrowser.Document.ExecCommand("Paste", false, null);
    wordDoc.Close();
    wordApp.Quit();
}

private void LoadPdfDocument(string filePath)
{
    string pdfToHtmlExePath = @"C:\Program Files (x86)\Bytescout PDF To HTML SDK\pdf2html.exe";
    string outputHtmlFilePath = Path.Combine(Path.GetTempPath(), Path.GetFileNameWithoutExtension(filePath) + ".html");

    ProcessStartInfo startInfo = new ProcessStartInfo(pdfToHtmlExePath);
    startInfo.Arguments = string.Format("\"{0}\" \"{1}\"", filePath, outputHtmlFilePath);
    startInfo.WindowStyle = ProcessWindowStyle.Hidden;

    Process.Start(startInfo).WaitForExit();

    webBrowser.Navigate(outputHtmlFilePath);
}