private void button4_Click(object sender, EventArgs e)
{
biletduzenle formkapaA = new biletduzenle();
formkapaA.Close();
biletbul btt = new biletbul();
btt.Show();
this.Hide();
}
private void biletBulToolStripMenuItem_Click(object sender, EventArgs e)
{
Form1 formkapa = new Form1();
formkapa.Close();
biletbul btt = new biletbul();
btt.Show();
this.Hide();
}