Question

I have used solution of Mutex to disallow opening more than one instance of my application at the same time

but, when i use Switch User in windows and open another user, and try to open the application, it opened normally and can’t detect that it’s running on other account

how could i solve something like this and disallow opening the application among Logged in Windows User Accounts

i am using code like this

Dim onlyInstance As Boolean = False
_mutex = New Mutex(True, "Application Name", onlyInstance)
If Not onlyInstance Then
   MessageBox.Show("Application is already running.", "Error.")
   System.Diagnostics.Process.GetCurrentProcess.Kill()
   System.Diagnostics.Process.GetCurrentProcess.WaitForExit()
End If

Answer 1

If you make your mutex global, then it will be visible to all users:

mutexName = String.Format("Global\\{{{0}}}", "Application Name"); 

From the documentation:

A named system mutex can have two levels of visibility. If its name
begins with the prefix “Global\”, the mutex is visible in all terminal
server sessions. If its name begins with the prefix “Local\”, the
mutex is visible only in the terminal server session where it was
created. In that case, a separate mutex with the same name can exist
in each of the other terminal server sessions on the server. If you do
not specify a prefix when you create a named mutex, it takes the
prefix “Local\”. Within a terminal server session, two mutexes whose
names differ only by their prefixes are separate mutexes, and both are
visible to all processes in the terminal server session. That is, the
prefix names “Global\” and “Local\” describe the scope of the mutex
name relative to terminal server sessions, not relative to processes.