void OnContactStatusChange(Object eventContactObject, MISTATUS eventStatus)
{
IMessengerContact eventContact = eventContactObject as IMessengerContact;
if ((null == eventContact) || (eventContact.SigninName != contact.SigninName))
{
return;
}
AvailabilityChanged(this, new EventArgs());
}
internal MessengerContact(IMessengerContact contact) => this._contact = contact;