<?php
namespace Vendor\Namespace\Block\Adminhtml\Select;
class Edit extends \Magento\Backend\Block\Widget\Form\Container
{
    protected $_coreRegistry = null;

    public function __construct(
        \Magento\Backend\Block\Widget\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->_objectId = 's_no';
        $this->_controller = 'adminhtml_select';
        $this->_blockGroup = 'Vendor_Namespace';

        parent::_construct();

    }
}