privileges to from and buttons

First implement the role based code while login. Whenever a specific user login to the application get the role based on login id and password. In the specific forms where you want to disable the button then check there what is the role by using if condition and if it's satisfy then disable the button else enable it. Thanks

Thanks for the reply I mean how to implement in code How to add privilege on event

Based on the roles you can do that. For example, admin role can access everything, for employee role you can disable the button. Thanks