private void Logout_ToolStripMenuItem2_Click(object sender, EventArgs e) // 로그 아웃 버튼 클릭
{
LoginID = "";
Book_Rental_List_Panel.Hide();
Main_Panel.Show();
}
private void Admin_Logout_ToolStripMenuItem_Click(object sender, EventArgs e) // 관리자 로그아웃
{
Admin_Panel.Hide();
Main_Panel.Show();
}