How to use Unsafe Methods with UI Permissions

Hello,

I have simple dilemma about what is propper syntax and semanthics when using  Unsafe Methods with UI Permissions. Here is example of program code :

 

https://docs.microsoft.com/sr-latn-rs/visualstudio/code-quality/ca1060-move-p-invokes-to-nativemethods-class?view=vs-2015&redirectedfrom=MSDN#unsafenativemethods-example 

 

In the essence syntax is this :

 

 

 

What I did not understand ,

Do I have to repeatedly create New UI Security Permission, each time I call Unsafe Method ?

If I have to call many different Unsafe Methods successively , do I have to create new UI Security Permission for each one of them.

 

 

All the best,

Želko Peric