Hi Sugandi,
Thanks for contacting Syncfusion support,
We have analyzed your query (The server need the property and value (false) while post the form) and this is the natural behavior of checkboxes in HTML. If checked, then its value will be sent as parameter. If unchecked, then its value will not be sent as parameter in JavaScript. This behavior is used to distinguish checked state from unchecked state checkboxes in server side.
Regards,
Sureshkumar P