public void EliminarTarea(Tarea tarea)
{
if (Tareas.Contains(tarea))
{
Tareas.Remove(tarea);
}
}
public void BorrarTarea(int id)
{
Tareas.Remove(Tareas.Where(i => i.Id == id).Single());
SaveChanges();
Console.WriteLine("Tarea Borrado.");
}