public Account GetAccount(StorageSession context)
 {
     return this._account != null && this._account.Context == context
         ? this._account
         : this._account = context.Load(this._accountId);
 }
 public Activity GetActivity(StorageSession context)
 {
     return this._activity != null && this._activity.Context == context
         ? this._activity
         : this._activity = context.Load(this._activityId);
 }