private void btn_Ara_Click(object sender, EventArgs e)
{
if (txt_Kadi.Text == "")
{
b_Listele();
}
else
{
string kadi = txt_Kadi.Text.ToString();
veritabani vt = new veritabani();
vt.baglan();
vt.b_Ara(kadi, dataGridView1);
vt.baglanti_Kes();
}
}