Login status doesnot change on successful login

hello guys,
this is the source of my code behind file..

while (rs.Read())
{
if (rs.GetString(0) == DropDownList1.SelectedValue)
{
pass = rs.GetString(1);
secure = rs.GetString(2);
if (pass == TextBox1.Text)
{
FormsAuthentication.RedirectFromLoginPage(DropDownList1.SelectedValue, false);

Response.Redirect("~/users/FormIndex.aspx?username=" + secure);
}
}

else
Label3.Visible = true;
}


whenever i enter my username and password it get successfully logined but my login status does not change to logout. it shows login after the successfull login

Note : same coder running well under my localhost and same code running in my two other websites.

Any help will be apreciated