webbrowser control login problem

Question

hi,

i am developing one application in this i need to automatically login in website but this website has connection encrypted:High grade Encryption(AES-128,128bit keys) and login window have three fields username inputbox type="text" password inputbox type="password" and third terminal dropdownlist box which has two values. i am using webbrowser control for this i have written code for this also but when i run my programme only username and terminal (dropdownlist) shows the value password input box doesn't shows the value so what's the problem so please help me its urgent. my code as below

If WebBrowser1.ReadyState = WebBrowserReadyState.Complete Then
Dim frmform As HtmlElement = WebBrowser1.Document.Forms("aspnetForm")
frmform.All("ctl00_lnkLogin").InvokeMember("Click")
frmform.All("ctl00_txtUserName").SetAttribute("value", sUserID)
Dim oPassword As HtmlElement
oPassword = WebBrowser1.Document.All.Item("ctl00$txtPassword")
oPassword.InnerText = sPWD
'frmform.All("ctl00_txtPassword").SetAttribute("value", sPWD)
Dim He As HtmlElement = WebBrowser1.Document.GetElementById("ctl00_cboTerminal")
He.SetAttribute("SelectedIndex", "1")
'frmform.GetElementsByTagName("select")(0).Document.GetElementsByTagName("option")(1).SetAttribute("selected", "true")
''frmform.All("ctl00$cboTerminal").InvokeMember("SelectedIndexChanged")
''frmform.GetElementsByTagName("select")(0).Document.GetElementsByTagName("option")(1).SetAttribute("selected", "true")
frmform.All("ctl00_btnLogin").Enabled = True
frmform.All("ctl00_btnLogin").InvokeMember("Submit")
End If

Thanks and Regards

Arshad