protected void btnSend_Click(object sender, EventArgs e)
{
bool isSending = false;
Newsletter.Lock.AcquireReaderLock(Timeout.Infinite);
isSending = Newsletter.IsSending;
Newsletter.Lock.ReleaseReaderLock();
// if another newsletter is currently being sent, show the panel with the wait message,
// but don't hide the input controls so that the user doesn't loose the newsletter's text
if (isSending)
{
panWait.Visible = true;
}
else
{
// if no newsletter is currently being sent, send this new one and
// redirect to the page showing the progress
int id = Newsletter.SendNewsletter(txtSubject.Text,
txtPlainTextBody.Text, txtHtmlBody.Value);
this.Response.Redirect("SendingNewsletter.aspx");
}
}