private void button1_Click(object sender, EventArgs e)
{
FrmGiris frm = new FrmGiris();
frm.MdiParent = this;
frm.Show();
}
private void btnKayıtOl_Click(object sender, EventArgs e)
{
FrmKayitOl kayit = new FrmKayitOl();
kayit.Show();
FrmGiris giris = new FrmGiris();
giris.Hide();
}