protected void btnSend_Click(object sender, EventArgs e)
    {
        // Validate date/time
        if (dtpMailout.SelectedDateTime == DateTimeHelper.ZERO_TIME)
        {
            ShowError(GetString("newsletterissue_send.invaliddatetime"));
            return;
        }

        IssueInfo winner        = (IssueInfo)EditedObject;
        int       parentIssueId = winner.IssueVariantOfIssueID;

        // Get A/B test info
        ABTestInfo abi = ABTestInfoProvider.GetABTestInfoForIssue(parentIssueId);

        if (abi != null)
        {
            IssueInfo issue = IssueInfoProvider.GetIssueInfo(parentIssueId);

            // Check if winner was selected and sent
            if (abi.TestWinnerIssueID != 0)
            {
                if ((issue.IssueStatus == IssueStatusEnum.Finished) || (issue.IssueStatus == IssueStatusEnum.Sending))
                {
                    // Winner was already sent
                    CloseDialogAndRefreshParent();
                    return;
                }
            }

            // Update A/B test info and winner selection task (if exist)
            abi.TestWinnerOption = ABTestWinnerSelectionEnum.Manual;
            NewsletterTasksManager.EnsureWinnerSelectionTask(abi, issue, false, DateTime.Now);

            abi.TestSelectWinnerAfter = 0;
            abi.TestWinnerSelected    = DateTime.Now;
            abi.TestWinnerIssueID     = winner.IssueID;
            ABTestInfoProvider.SetABTestInfo(abi);

            if ((issue != null) && (winner != null))
            {
                // Copy data from winner to parent
                IssueHelper.CopyIssueProperties(winner, issue, "issuesubject;issuetext;issuetemplateid;issueshowinnewsletterarchive;issuesendername;issuesenderemail");
                IssueInfoProvider.SetIssueInfo(issue);

                // Remove previous scheduled task of this issue
                NewsletterTasksManager.DeleteMailoutTask(issue.IssueGUID, issue.IssueSiteID);

                DateTime    mailoutTime = dtpMailout.SelectedDateTime;
                IssueSender issueSender = new IssueSender(IssueInfoProvider.GetIssueInfo(parentIssueId));
                issueSender.Send(mailoutTime);
            }
        }

        // Close dialog and refresh parent page
        CloseDialogAndRefreshParent();
    }