1/// <summary>

2/// A workaround to update a WebBrowser control's text

3/// </summary>

4/// <param name="html">The full HTML text to write</param>

5private void WriteDynamicHTMLToWebBrowser(string html)
6{
7    webbrowserControl1.AllowNavigation = false;
8    if (webbrowserControl1.Document != null) 
9        webbrowserControl1.Document.OpenNew(true);
10    else 
11        webbrowserControl1.Navigate("about:blank");
12
13    webbrowserControl1.Document.Write(html);
14}

WriteDynamicHTMLToWebBrowser("
Hi there!
");