private bool ValidateLogOn(string userName, string password)
{
if (String.IsNullOrEmpty(userName))
{
ModelState.AddModelError("username", "You must specify a username.");
}
if (String.IsNullOrEmpty(password))
{
ModelState.AddModelError("password", "You must specify a password.");
}
if (!MembershipService.ValidateUser(userName, password))
{
ModelState.AddModelError("_FORM", "The username or password provided is incorrect.");
}
return ModelState.IsValid;
}