private void btn_MusteriEkle_Click(object sender, EventArgs e)
{
Form_Musteri musteri = new Form_Musteri();
musteri.ShowDialog();
}
private void dg_Musteriler_DoubleClick(object sender, EventArgs e)
{
Form_Musteri musteri = new Form_Musteri(MusteriId);
musteri.ShowDialog();
}