C# Webrowser SetAttribute with the same ids

Question

I have two html forms on a website, both with the same input name, and the same submit button name.

How do I go about filling in both of the input boxes, and clicking both of the forms?

I would like to have an int variable to keep track of what one was last clicked ( ie. so I can click the first one, go back to the page and then click the second one!

I tried this but had no luck in general with filling in both boxes with my name:

foreach (HtmlElement he in webBrowser1.Document.All.GetElementsByName("name"))
        {
            try
            {
                webBrowser1.Document.GetElementById("name").SetAttribute("value", "TestUser");
            }
            catch (Exception ex)
            {
                Console.Write("\nError: " + ex);
            }
        }

Any tips or ideas would help out a lot :$