Enable and disable

I want to enable and disable the button based on user name from Radzen, So i am setting code

${security.user.name.robksh} but its not working is there any option to disable and enable and buttons based on user name.

The name property is a string. You need to compare it with the target value e.g. ${security.user.name == 'robksh'}

I am getting error if I declare for above code