filling values in a web page using C#

[prayag.narula]

Hi i am developing an IE plugin which will auomatically provide
username and password to web pages on click of a button. I was trying
to develop a dummy button to test and am trying to use
HTMLInputElementClass. the code compiles well but gives a un time
exception in the browser. the code goes like :

private void bttnEnterUserName_Click(object sender, EventArgs e)
{
HTMLDocumentClass doc = new HTMLDocumentClass();
doc = (HTMLDocumentClass) this.Explorer.Document;
HTMLInputElementClass ele = new HTMLInputElementClass();

if (doc.url.ToString() ==
"https://www.google.com/accounts/ServiceLogin?service=mail&passive=true&rm=false&co ntinue=http%3A%2F%2Fmail.google.com%2Fmail%2F%3Fui %3Dhtml%26zy%3Dl&ltmpl=cm_blanco&ltmplcache=2")
{

foreach (HTMLInputElementClass element in
doc.getElementsByTagName("input"))
{
ele = (HTMLInputElementClass)
element.getAttribute("Email", 0);
element.value = "prayag.narula";
}
}

}
what am i doing wrong. Wat other aproach can i use???