title: how to create and use a global variables in WPF (c#)
body: <p>i have an application in WPF (C# ) that have multi users, the user can do different operations using the application but, every user has different access permission i want to create a variable in the first window that contains the name of the user , cause i need to store it in another table in the database ( every time the user do an operation i save his name and the time of this operation in the table ) , so now i don't know how to create a variable that can be used in different windows of the application</p>