Clicking button without ID by c# webbrowser

[ozgurdeniz]

private void webBrowser1_Doc umentCompleted( object sender, WebBrowserDocum entCompletedEve ntArgs e)
{
foreach (HtmlElement el in webBrowser1.Doc ument.GetElemen tsByTagName("in put"))

{
if (el.GetAttribut e("value") == "Excel Link")
{
String lan = el.GetAttribute ("value");
textBox6.Text = lan;


el.InvokeMember ("click");

}
}
}