Get HTML code not workin

[sherlockturtle]

When i run this code to get results from yahoo or google it does not work and it says that that ids not there but it always is."Object reference not set to an instance of an object."

Public Class Form2


    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
        If (google.Checked = True) Then
            Dim PageElements As HtmlElement = WebBrowser1.Document.GetElementById("rso")
            TextBox2.Text = PageElements.OuterHtml
            Dim text = TextBox2.Text
        End If
        If (yahoo.Checked = True) Then
            Dim PageElements As HtmlElement = WebBrowser1.Document.GetElementById("we")
            TextBox2.Text = PageElements.OuterHtml
            Dim text = TextBox2.Text
        End If


    End Sub

        Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            WebBrowser1.Navigate(TextBox1.Text)
        End Sub

    Private Sub Google_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Google.CheckedChanged
        TextBox1.Text = "http://www.google.com/search?q="
    End Sub

    Private Sub Yahoo_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Yahoo.CheckedChanged
        TextBox1.Text = "http://search.yahoo.com/web?fr="
    End Sub
End Class

[kareninstructor]

The attached VS2010 project shows how to get elements from a WebBrowser set to www.google.com, determine what was typed in for a search and how to set the search text. I don't use Yahoo or care to even tinker with Yahoo so nothing for Yahoo.

I fully tested it as is not to cause a run time exception.

[Doogle]

I guess that the problem is caused by attempting to access the Document Object before the page requested has loaded. You could use the 'sender' object and the ReadyState property of the WebBrowser to make sure

    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
        If sender Is WebBrowser1 And WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
            If (google.Checked = True) Then
                Dim PageElements As HtmlElement = WebBrowser1.Document.GetElementById("rso")
                TextBox2.Text = PageElements.OuterHtml
                Dim text = TextBox2.Text
            End If
            If (yahoo.Checked = True) Then
                Dim PageElements As HtmlElement = WebBrowser1.Document.GetElementById("we")
                TextBox2.Text = PageElements.OuterHtml
                Dim text = TextBox2.Text
            End If
        End If


    End Sub