Adding Custom attributes to the page directive in asp.net -

Is there a way to add custom credentials to a @page directory, and for this, design time support such as intellance can also be found ?

I used it as an indicator.

I have a feature that will give God the option to select the value from the list. Something similar to the EnableSessionState attribute I understand is that I need to define an enumeration for the values, but I do not understand how this design was made available during the time.

Take a look: it may be useful