I already tried this
     var cmd = connection.CreateCommandAndParameters("/tool/user-manager/user/add", "customer", "kamrul",
                "username", "test007", "password", "12345678");
            cmd.ExecuteNonQuery();
but giving this error:
    no such command or directory (user-manager)
 
                        
hi I don't know about the tiknet but in mikrotik terminal you can add user using this command
I guess you can use it in your code like
hope this helps