如何从使用Asp认证的用户谷歌帐户中获取FirstName + LastName。在应用程序MVC5身份

I have created a MVC 5 application, and I'm able to authenticate the user using Google External login which is an out of box feature. I have observed that by authenticating the user using google account, UserName and Email are stored in database with the same value(i.e., Email for both of them). How do i retreive FirstName, LastName, from the registered google account.I have created a MVC 5 application, and I'm abl