public ClaimsIdentity CreateIdentity(User user, string authenticationType)
{
user.ThrowIfNull("user");
authenticationType.ThrowIfNull("authenticationType");
var appIdentityUser = IdentityModelFactory.Create(user);
var claimsIdentity = _userManager.CreateIdentity(appIdentityUser, authenticationType);
user.CopyFrom(appIdentityUser);
return(claimsIdentity);
}