private void DeleteUser()
        {
            lblAmendError.Text = "";
            bool   success  = false;
            string username = tbUsername.Text;

            try
            {
                using (QCAstServiceClient client = new QCAstServiceClient())
                {
                    success = client.DeleteUser(int.Parse(tbUserId.Text));
                }
                if (success)
                {
                    ClearTextAndListBoxes();
                    lblSuccess.Text = string.Format("User {0} has been successfully deleted.", username);
                }
                else
                {
                    lblAmendError.Text = "Cannot delete the user at this time. Please try again later.";
                }
            }
            catch (Exception ex)
            {
                NotifyWebmasterOfError("Billing", "User Management DeleteUser", ex.ToString());
                lblAmendError.Text =
                    "The website encountered an error processing your request. The webmaster has been notified and will be attending to it shortly.";
            }
        }