SHDocVwSample12

test.cs

public void JumpFramePage()
{
    var IE = new SHDocVw.InternetExplorer();
    IE.Visible = true;
    object URL = "http://homepage3.nifty.com/abe-hiroshi/";
    IE.Navigate2(ref URL);
    IE.Wait();
    var doc = IE.Document as mshtml.IHTMLDocument2;
    object x = 1;
    var window = doc.frames.item(ref x) as mshtml.HTMLWindow2;
    object url2 = window.location.href;
    IE.Navigate2(ref url2);
}