How to create multiple entities of same type in a single go in CRM online?

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CRM

Hello Developers ,

I am integrating MS Dynamics CRM online with my ASP.Net MVC application. I am creating a synchronization process between both. I'm stuck at the point where

1.I need to check if user has entered valid CRM credentials ie. server address, domain, username and password etc. I am not sure which class is to use for that?

2. I want to create multiple entities of same type in a single go in CRM online from my Application. Currently I am using ServiceProxy's Create() method to do so . How can I create , for instance, 10 contacts in a single request ? I mean is there any way to send list of objects to CRM server and create them there /

Looking forward to hear from you asap.

Thanks,
Sukhdeep