/**
  * Delete an activity item.
  * 
  * @since 2.0.0
  * @access public
  * 
  * @param int $ActivityID Unique ID of item to delete.
  * @param string $TransientKey Verify intent.
  */
 public function Delete($ActivityID = '', $TransientKey = '')
 {
     $Session = Gdn::Session();
     if (!$Session->ValidateTransientKey($TransientKey)) {
         throw PermissionException();
     }
     if (!is_numeric($ActivityID)) {
         throw Gdn_UserException('Invalid activity ID');
     }
     $HasPermission = $Session->CheckPermission('Garden.Activity.Delete');
     if (!$HasPermission) {
         $Activity = $this->ActivityModel->GetID($ActivityID);
         if (!$Activity) {
             throw NotFoundException('Activity');
         }
         $HasPermission = $Activity['InsertUserID'] == $Session->UserID;
     }
     if (!$HasPermission) {
         throw PermissionException();
     }
     $this->ActivityModel->Delete($ActivityID);
     if ($this->_DeliveryType === DELIVERY_TYPE_ALL) {
         Redirect(GetIncomingValue('Target', $this->SelfUrl));
     }
     // Still here? Getting a 404.
     $this->ControllerName = 'Home';
     $this->View = 'FileNotFound';
     $this->Render();
 }