private void Textbox1_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Down || e.KeyCode == Keys.Enter) { Textbox2.Focus(); } }
private void button4_Click_1(object sender, EventArgs e) { try { if (Textbox1.Text == "") { MessageBox.Show("Please enter username", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); Textbox1.Focus(); return; } else if (Textbox2.Text == "") { MessageBox.Show("Please enter password", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); Textbox2.Focus(); return; } else { i = 0; koneksi.Open(); MySqlCommand cmd = koneksi.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "select * from akun_siswa where username_siswa='" + Textbox1.Text + "'and password_siswa='" + Textbox2.Text + "'"; cmd.ExecuteNonQuery(); DataTable dt = new DataTable(); MySqlDataAdapter da = new MySqlDataAdapter(cmd); da.Fill(dt); i = Convert.ToInt32(dt.Rows.Count.ToString()); if (i == 0) { MessageBox.Show("you have entered invalid username or password", "Error"); Textbox1.Text = ""; Textbox2.Text = ""; } else { save_data2(); MessageBox.Show("Welcome Student SMKN 10 Jakarta", "Login"); Form2 f2 = new Form2(); f2.Show(); this.Hide(); Textbox1.Text = ""; Textbox2.Text = ""; } koneksi.Close(); } } catch (Exception ex) { koneksi.Close(); MessageBox.Show(ex.ToString(), ex.Message); } }