Webbrowser help

So I have to configure a lot of routers for my job and so far I've gotten my c# program to work beautifully and it saves me a lot of time , the problem comes when they upgraded the firmware on the routers and they now have drop down boxes , How do I get these filled out ? It doesn't matter what is in them because they're for the date which auto updates anyways. My first idea was just to try to set a text value and maybe it would select the right one so I tried.
 try
            {
                HtmlElement Month = this.Browser.Document.GetElementById("pse_5337_105959_dob_month_short");
                Month.InnerText = "December";
                     
            }
            catch{}


Now what this did , was basically eliminate all the options in the dropdown box and the form wouldn't process it. So then I tried a more direct sendkeys approach. I figured if I could set focus and then send keys a down arrow or something it would work. Well it worked for the first dropdown element but after I added more they all stopped working. Any ideas for either method would be greatly appreciated. NOTE : I have all these going on webbrowser completed.


  try
            {
                HtmlElement Month = this.Browser.Document.GetElementById("pse_5337_105959_dob_month_short");
             
                Month.Focus();
                SendKeys.Send("{Down}");
            }
            catch{} Start Free Trial