protected void btnGetOTP_ServerClick(object sender, EventArgs e)
        {
            string    getPhoneNo = txtPhoneNumber.Value;
            DataTable dt         = CandidateManager.getCandidateByPhoneNumber(getPhoneNo);

            if (dt.Rows.Count > 0)
            {
                sms.SendOTP(getPhoneNo);
            }
            else
            {
                msgErrorUser.Visible = true;
            }
        }