private void button1_Click(object sender, EventArgs e)
        {
            Form frm = new frmDedemanMusteriler();

            frm.Show();
            this.Hide();
        }
        private void btnDedeman_Click(object sender, EventArgs e)
        {
            Form dedemanMusteriler = new frmDedemanMusteriler();

            dedemanMusteriler.Show();
        }