Interface Callback in Xamarin

Question

I am trying to write a interface callback from a java library inside Xamarin using c#, Below is the code snippet,

Connector.getInstance().login(email, new ILoginCallback()
{ @Override public void onSuccess(long heloUserId)
{ /* call the required Activity for successful login */ }
@Override public void onPinverification()
{ /*call the Pin verification activity to validate pin */ }
@Override public void onFailure(String description)
{ /*show the toast msg for failure*/ }
});

I am unable to do interface callback in c# which blocked me to get the success or failure result.

Any Help appreciated.