//Low-level methods
public ILogin FindLogin(IEntitySession session, string userName, string password, Guid?tenantId)
{
var context = session.Context;
context.ValidateNotEmpty(userName, ClientFaultCodes.ValueMissing, "UserName", null, "UserName may not be empty");
context.ValidateNotEmpty(password, ClientFaultCodes.ValueMissing, "Password", null, "Password may not be empty");
context.ThrowValidation();
userName = CheckUserName(context, userName);
var userNameHash = _hashService.ComputeHash(userName);
var tenantIdValue = tenantId == null ? Guid.Empty : tenantId.Value;
var qryLogins = from lg in session.EntitySet <ILogin>()
where lg.UserNameHash == userNameHash && lg.UserName == userName
select lg;
// Match password
using (session.WithElevatedRead()) {
var login = qryLogins.FirstOrDefault();
return(login);
}
}