Trying to retrieve webpage after logging in

I'm trying to log into a page, and retrieve the HTML, which can only be retrieved once I log in. If I used the URL

Code:

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http://www.mywebsite.com/login.php?username=myusername&password=mypassword

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explicitly in the web browser, it works fine and I log in, but when I try to do it in the VB .NET code, it doesn't work. I provided the code below.

Code:

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    Private Sub btnSync_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSync.Click
        Dim request As WebRequest = WebRequest.Create("http://www.mywebsite.com/login.php?username=myusername&password=mypassword")
        Dim response As WebResponse = request.GetResponse()
        Dim s As Stream = response.GetResponseStream()
        Dim sr As StreamReader = New StreamReader(s, Encoding.ASCII)
        Dim doc As String = sr.ReadToEnd()

        Debug.Print(doc)
    End Sub

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Any ideas why this isnt working?

what result do you get?

Also what horribly insecure website passes the username and password across a query string?

I just get the web page that says "Invalid Login, Please try again". Its basically just a rejection page that you would get if you typed in your username and password incorrectly.

Ideas?