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WebBrowser1.Document.GetElementById("txtLogon").SetAttribute("value", TextBox1.Text)
WebBrowser1.Document.GetElementById("txtPassword").SetAttribute("value", TextBox2.Text)
Dim allelements As HtmlElementCollection = WebBrowser1.Document.All
For Each webpageelement As HtmlElement In allelements
If webpageelement.GetAttribute("id") = "btnLogon" Then
webpageelement.InvokeMember("click")
End If
Next

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        WebBrowser1.Navigate("http://login.yahoo.com/")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        WebBrowser1.Document.GetElementById("login").SetAttribute("value", TextBox1.Text)
        WebBrowser1.Document.GetElementById("passwd").SetAttribute("value", TextBox2.Text)

        WebBrowser1.Document.GetElementById(".save").InvokeMember("click")
    End Sub

End Class