private void checkButton_Click(object sender, EventArgs e)
        {
            int status = CenterHandler.GetCenterStatus(LoginHandler.CenterId);

            if (status == 1)
            {
                if (nidTextBox.Text != "")
                {
                    try
                    {
                        long nid         = long.Parse(nidTextBox.Text);
                        int  voterStatus = VoterHandler.CheckStatus(nid);
                        if (voterStatus == 0)
                        {
                            MessageBox.Show("Cannot find the NID.");
                        }
                        else if (voterStatus == 1)
                        {
                            MessageBox.Show("Valid NID.");
                        }
                        else if (voterStatus == 2)
                        {
                            MessageBox.Show("Valid NID and Processed, but did not vote");
                        }
                        else if (voterStatus == 3)
                        {
                            MessageBox.Show("Vote Completed");
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show("Enter proper NID.");
                    }
                }
                else
                {
                    MessageBox.Show("Enter proper NID.");
                }
            }
            else if (status == 2)
            {
                MessageBox.Show("Center is blocked.");
            }
            else
            {
                MessageBox.Show("Election is not going on currently.");
            }
        }