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copied!<p>Well if you were working with the site developers to create a solution for your application, then you would use <code>ObjectForScripting</code> to communicate between JavaScript and the app. There a good article <a href="http://www.dotnetfunda.com/articles/article840-working-with-webbrowser-in-wpf-.aspx" rel="nofollow noreferrer">here</a>, and another question which might be helpful <a href="https://stackoverflow.com/questions/3694028/invoke-c-code-from-javascript-in-a-document-in-a-webbrowser">here</a>.</p> <p>However as I understand your question, the site is an arbitrary third party site with no affiliation to your application, and you want to auto-fill some form values and submit the form within your code.</p> <p>To do this you can handle the <code>LoadCompleted</code> event of the WebBrowser. This is called when the loaded document <code>readyState</code> is changed to completed. You can therefore use this event as a hook to then set/read the document form values. Note you will need to add a reference to <code>Microsoft mshtml</code> in the project. </p> <p>The following is an MVVM style (PRISM) command, which allows an event to bind directly to the <code>ViewModel</code> using behaviors. This is equivalent to registering an event handler in code-behind.</p> <pre><code>public ICommand LoadCompleted { get { return new EventToCommandWithSender<NavigationEventArgs>( (s,e) => { WebBrowser browser = (WebBrowser) sender; // false if nested frame if (e.IsNavigationInitiator) { mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)browser.Document; // always completed var readyState = doc.readyState; // populate form var name = doc.body.document.getElementById("username"); name.value = "@TheCodeKing"; // submit form var submit = doc.body.document.getElementById("submit"); submit.Click(); } }); } } </code></pre> <p>Unfortunately the <code>NavigationEventArgs</code> don't provide a way to access the HTML document or request data. It does contain a <code>WebRequest</code> property but this has not been implemented, and will always be null. In my example I've assumed a custom <code>EventToCommandWithSender</code> class which providers the sender as well as the event ARGs when the event fires, but it's down to your own implementation to get access to the sender.</p>

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