private void btnKembali_Click(object sender, EventArgs e)
        {
            FormUtama fu = new FormUtama();

            fu.Show();
            this.Hide();
        }
        private void btnHalamanUtama_Click(object sender, EventArgs e)
        {
            string       peringatan = "Apakah kamu yakin ingin kembali ke Form Utama???";
            DialogResult dr         = MessageBox.Show(peringatan, "Konfirmasi Keluar", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);

            if (dr == DialogResult.Yes)
            {
                FormUtama fu = new FormUtama();
                fu.Show();
                this.Hide();
            }
        }