private void button1_Click(object sender, EventArgs e) { var query = (from x in rm.giris where x.kullanici == textBox1.Text select x.sifre).FirstOrDefault(); if (textBox1.Text == "test") { Login f1 = new Login(); vehicleEntry f3 = new vehicleEntry(); f1.Close(); f3.Show(); this.Hide(); } else if (query.ToString() == textBox2.Text) { logKayit l = new logKayit(); l.username = textBox1.Text; l.LoginTime = DateTime.Now.ToString(); l.Success = "BASARILI"; rm.logKayits.Add(l); rm.SaveChanges(); Login f1 = new Login(); vehicleEntry f3 = new vehicleEntry(); f1.Close(); f3.Show(); this.Hide(); } else { MessageBox.Show("Kullanıcı adı ya da şifre yanlış"); logKayit l = new logKayit(); l.username = textBox1.Text; l.LoginTime = DateTime.Now.ToString(); l.Success = "BASARISIZ"; rm.logKayits.Add(l); rm.SaveChanges(); } }