How to extend AspNetUserLogin in ASP.Net Identity?

When a user logs in with an external login provider like facebook or twitter , I want to store it ExternalIdentity.Name

in the database so that it can be displayed on the user details page.

What I have now:

[AllowAnonymous]
public ActionResult ExternalLoginCallback(string returnUrl)
{
    var loginInfo = AuthenticationManager.GetExternalLoginInfo();
    if (loginInfo == null)
        return RedirectToAction("Details", new { message = "LinkLoginError" });

    // Sign in the user with this external login provider if the user already has a login
    var result = SignInManager.ExternalSignIn(loginInfo, isPersistent: false);
    ...
}

      

        
        
        
      

    

How can I extend / change / override the method SignInManager.ExternalSignIn

to save the table loginInfo.ExternalIdentity.Name

to dbo.AspNetUserLogins

?