private void btnTCKontol_Click(object sender, EventArgs e)
{
if (txtMusteriTC.Text == "")
{
txtMusteriTC.Text = "0";
}
string queryTCKontrol = "select * from Musteriler where TCKimlikNo='" + txtMusteriTC.Text + "'";
SqlConnection cnnTCKontrol = new SqlConnection(connectionString);
cnnTCKontrol.Open();
SqlCommand cmdTCKontrol = new SqlCommand(queryTCKontrol);
cmdTCKontrol.Connection = cnnTCKontrol;
SqlDataAdapter daTCKontrol = new SqlDataAdapter(queryTCKontrol, cnnTCKontrol);
SqlDataReader drTCKontrol = cmdTCKontrol.ExecuteReader();
if (drTCKontrol.Read())
{
MessageBox.Show("Müşteri Kayıtlı");
}
else
{
MessageBox.Show("Yeni Müşteri");
this.Hide();
frmMusteriEkle frmMusteriEkle = new frmMusteriEkle();
frmMusteriEkle.Show();
GosterMusteriler();
}
cnnTCKontrol.Close();
}
private void btnMusteriEkle_Click(object sender, EventArgs e)
{
frmMusteriEkle frmMusteriEkle = new frmMusteriEkle();
this.Hide();
frmMusteriEkle.Show();
}