private void bunifuThinButton21_Click(object sender, EventArgs e)
        {
            LoginAdmin la = new LoginAdmin(sqlMng);

            la.Show();
            this.Hide();
        }
        private void nBtn_LogOut_Click(object sender, EventArgs e)
        {
            _admin = null;
            LoginAdmin _loginAdmin = new LoginAdmin(_sqlMng);

            _loginAdmin.Show();
            this.Hide();
        }
        //Admin
        private void button2_Click(object sender, EventArgs e)
        {
            SqlMng = SqlMng.GetObject();
            LoginAdmin loginAdmin = new LoginAdmin(SqlMng);

            loginAdmin.Show();
            this.Hide();
        }