Multiple membership and role providers

 Hello,
I am currently working on a website that has dual membership providers, a SqlMembershipProvider and an ActiveDirectoryMembershipProvider.  I also have two role providers configured.

The following code is executed on log-in:
protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
{
Login login = (Login)sender;
MembershipProvider ADMembership = Membership.Providers["ADMembershipProvider"];
if (Membership.ValidateUser(login.UserName, login.Password)) //Default is SQL Membership
{
e.Authenticated = true;
}
else
{
if (ADMembership .ValidateUser(login.UserName, login.Pa ...