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copied!<p>I've worked some time ago with the WebControl and like you wanted to load a html from memory but have the same problem, body being null. After some investigation, I noticed that the Navigate and NavigateToString methods work asynchronously, so it needs a little time for the control to load the document, the document is not available right after the call to Navigate. So i did something like (wbChat is the WebBrowser control):</p> <pre><code>wbChat.NavigateToString("<html><body><div>first line</div></body><html>"); DoEvents(); </code></pre> <p>where DoEvents() is implemeted as:</p> <pre><code>[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] public void DoEvents() { DispatcherFrame frame = new DispatcherFrame(); Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(ExitFrame), frame); Dispatcher.PushFrame(frame); } </code></pre> <p>and it worked for me, after the DoEvents call, I could obtain a non-null body:</p> <pre><code>mshtml.IHTMLDocument2 doc2 = (mshtml.IHTMLDocument2)wbChat.Document; mshtml.HTMLDivElement div = (mshtml.HTMLDivElement)doc2.createElement("div"); div.innerHTML = "some text"; mshtml.HTMLBodyClass body = (mshtml.HTMLBodyClass)doc2.body; if (body != null) { body.appendChild((mshtml.IHTMLDOMNode)div); body.scrollTop = body.scrollHeight; } else Console.WriteLine("body is still null"); </code></pre> <p>I don't know if this is the <strong>right</strong> way of doing this, but it fixed the problem for me, maybe it helps you too.</p> <p>Later Edit:</p> <pre><code>public object ExitFrame(object f) { ((DispatcherFrame)f).Continue = false; return null; } </code></pre> <p>The DoEvents method is necessary on WPF. For System.Windows.Forms one can use Application.DoEvents().</p>

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