How can we make a dynamimic read only grid control column cell in C# WPF devexpress

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C#

WPF

C#4.0

DevExpress

How can we make a dynamimic read only grid control column cell in c# wpf devexpress.
2 users - Admin and User
and a grid control name salary with columns :-
NO- Time - From - To - salry

salary can edit only when admin login.
salary cannot edit when user login.

How can it be do can u help me to make a convertor according to user the salary column cell to readonly=true and readonly=false

What I have tried:

i dont know how to make a convertor according can u please help us to make a convertor