private void dgv_UsersList_KeyDown(object sender, KeyEventArgs e)
        {
            switch (e.KeyValue)
            {
            case 116:
            {
                dgv_UsersList.DataSource = x.ReadAllUsers();
                break;
            }

            case 123:
            {
                if (dgv_UsersList.SelectedRows[0].Cells[2].Value.ToString() != "SysAdmin")
                {
                    DialogResult result = MessageBox.Show("Do you want DELETE this User: "******"User Delete", MessageBoxButtons.YesNo);
                    if (result == DialogResult.Yes)
                    {
                        x.DeleteUser(dgv_UsersList.SelectedRows[0].Cells[1].Value.ToString());
                        dgv_UsersList.DataSource = x.ReadAllUsers();
                    }
                }
                else
                {
                    MessageBox.Show("A System Administrator can not be Deleted");
                }
                break;
            }
            }
        }