private void button1_Click(object sender, EventArgs e)
{
Class1.pnrno = textBox1.Text.ToString();
biletbul tb = new biletbul();
tb.Close();
biletduzenle bt = new biletduzenle();
bt.Show();
this.Hide();
}
private void button4_Click(object sender, EventArgs e)
{
biletduzenle formkapaA = new biletduzenle();
formkapaA.Close();
biletbul btt = new biletbul();
btt.Show();
this.Hide();
}