Authentication using Secure LDAP (ie LDAPS)

Hello Everyone,

I am trying to validate a user against Active Directory.  I current use the following code and it works fine:

    bool authentic = false;
    PrincipalContext pc = new PrincipalContext(ContextType.Domain, domain);
    // validate the credentials against domain.  authentic is True if the account is valid, false if it    fails
    authentic = pc.ValidateCredentials(userName, password);

I pass in the Windows Domain, username, and password into the method and the method returns a true or false depending on the validity of the user account.

Now I have a new requirements that I must use SSL when making calls to LDAP.  How can I convert the code above so that I do the same thing but using LDAP over SSL?

Thank you in advance for any help you can provide.