private void addVoterButton_Click(object sender, EventArgs e) { try { if (nIdTextBox.Text != "" && centerComboBox.SelectedItem != null && seatComboBox.SelectedItem != null) { DialogResult dr = MessageBox.Show(string.Format("Are you sure to add voter with NID '{0}' under center '{1}'?", nIdTextBox.Text, centerComboBox.SelectedItem.ToString()), "Confirm?", MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (dr == DialogResult.Yes) { long nId = long.Parse(nIdTextBox.Text); if (VoterHandler.AddVoter(nId, seatComboBox.SelectedItem.ToString(), centerComboBox.SelectedItem.ToString())) { MessageBox.Show("Successfully added voter."); voterGrid.DataSource = VoterHandler.GetVoters(seatComboBox.SelectedItem.ToString(), centerComboBox.SelectedItem.ToString()); } else { MessageBox.Show("Voter already present."); } nIdTextBox.Text = ""; } } else { MessageBox.Show("Enter Information Properly."); } } catch (Exception ex) { MessageBox.Show("Enter NID properly."); } }