void btnDelete_Click(object sender, EventArgs e)
{
Letter.DeleteByLetterInfo(letterInfoGuid);
//LetterSubscriber.DeleteByLetter(letterInfoGuid);
subscriptions.DeleteByLetter(letterInfoGuid);
LetterInfo.Delete(letterInfoGuid);
WebUtils.SetupRedirect(this,
SiteRoot
+ "/eletter/Admin.aspx");
}