Appending parameters to WordPress query string in backend

Add a hidden input field to your form with name page and value my-wordpress-plugin, When the form is submitted it will be passed along with your other form data.

<input type="hidden" name="page" value="my-wordpress-plugin">

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)