private void getUsersAndLoadUserTable()
        {
            usersTable = userService.getUsers();

            grid_users.ItemsSource = null;

            DataTable dt = new DataTable();

            dt.Columns.Add("Username");

            for (int i = 0; i < usersTable.Rows.Count; i++)
            {
                DataRow filas = usersTable.Rows[i];

                dt.Rows.Add(filas["usr_Username"]);
            }

            grid_users.ItemsSource = dt.DefaultView;

            grid_users.MaxHeight = 400;
        }