Hi!

Here is my code that should fill in "user" and "password" fields on a webpage ("http://forgarden.ee/tellimus") and then click the button "submit" in webbrowser. But it doesn't work!
It gives me error:Object reference not set to an instance of an object.

Source code from webpage user and pass fields and button:

HTML Code:
...
<li>
                            <label for="email" class="required"><em>*</em>E-posti aadress</label>
                            <div class="input-box">
                                <input name="login[username]" value="" id="email" class="input-text required-entry validate-email" title="E-posti aadress" type="text">
                            </div>
                        </li>
                        <li>
                            <label for="pass" class="required"><em>*</em>Salasõna</label>
                            <div class="input-box">
                                <input name="login[password]" class="input-text required-entry validate-password" id="pass" title="Salasõna" type="password">
                            </div>
                        </li>
                    </ul>
                    <p class="required">* Nõutud väljad</p>
                </div>
            </div>
        </div>
        <div class="col2-set">
            <div class="col-1 new-users">
                <div class="buttons-set">
                </div>
            </div>
            <div class="col-2 registered-users">
                <div class="buttons-set">
                    <a href="http://forgarden.ee/tellimus/index.php/customer/account/forgotpassword/" class="f-left">Salasõna läks meelest?</a>
                    <button type="submit" class="button" title="Logi sisse" name="send" id="send2"><span><span>Logi sisse</span></span></button>
                </div>
            </div>

...

And here is my VB code:

Code:
Private Sub WebBrowser_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser.DocumentCompleted


        
        'Dim ForgardenURL As String
        'Dim Pass As String
        'Dim User As String


        'User = My.Settings.ForgardenUser
        'Pass = My.Settings.ForgardenPass
        'ForgardenURL = My.Settings.ForgardenURL


        'WebBrowser.Document.GetElementById("login[username]").SetAttribute("value", User)
        'WebBrowser.Document.GetElementById("login[password]").SetAttribute("value", Pass)
            

        'WebBrowser.Document.GetElementById("send").InvokeMember("click")

        


    End Sub

What has gone wrong here?