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VS 2008 Logging in usin WebBrowser, Object reference not set to an instance of an object.

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Hi,
i am making a log-in program for my website running phpBB3 and style called "0mega"
So, i have this code:
Code:

        WebBrowser1.Navigate("http://www.mywebsite.com/ucp.php?mode=login")
        Dim user As String = TextBox1.Text
        Dim pw As String = TextBox2.Text
        WebBrowser1.Document.GetElementById("username").SetAttribute("value", user)
        WebBrowser1.Document.GetElementById("password").SetAttribute("value", pw)
        WebBrowser1.Document.Forms(0).InvokeMember("login")

However this code gives me a error pointing at
Code:

WebBrowser1.Document.GetElementById("username").SetAttribute("value", user)
Quote:

NullReferenceException was unhandled
Object reference not set to an instance of an object.
But this code is just copied & pasted from a tutorial for logging in using WebBrowser, so why it doesnt work ? Same happens when i replace "user" directly with a username, i have no idea whats wrong.

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