C# WebBrowser - Manipulate Forms

Just wondering, if I load a site such as Facebook into a WebBrowser control h开发者_开发百科ow do I enter data into the form controls from WF/Desktop app?

Do I have to use the DOM?

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There is a Document property. The MSDN documentation has a good example on how to use it, the code is very similar to DOM manipulation you would've seen in Javascript.