private void button3_Click(object sender, EventArgs e)
{
menütatlı geri = new menütatlı();
this.Hide();
geri.Show();
}
private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
idnumber();
OleDbCommand cmd = new OleDbCommand("update sipariş set icecek= '" + comboBox3.Text.ToString() + "' where ID=@id", con);
cmd.Parameters.AddWithValue("@id", (Convert.ToInt32(label5.Text)));
con.Open();
cmd.ExecuteNonQuery();
con.Close();
menütatlı ileri = new menütatlı();
this.Hide();
ileri.Show();
}