How do I get directory role (global admin , user) of logged in user via azure graph API

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ASP

Azure

C#3.5

hello, i am new to asp.net and i am developing an application where i am suppose to get the directory role (global admin , user ) from azure for the logged in user and restrict access to pages unless the user is a global admin. how can this be achieved as i could not find any means to check if the user is global admin or not.

What I have tried:

tried the "user type " attribute and the "member of" attribute as per the graph api documentation but these are not the appropriate means to get the result for above stated problem. any help will be appreciated
thank you