c# - Alter Master Page based on login type: ASP -

currently work recreating c# asp application older asp framework. client wants sidebar on every page quick navigation. easy enough do. there 5 different user types application. not allowed access of links in side bar. have created master page every item in sidebar visible , functional.

i need know if there way dynamically make of items in master page's side bar no longer appear when specific user signed in.

also, if better create side bar dynamic data field .ascx file instead.