//public EmailSender(string to, string user, string orderDatetime)
 //{
 //    this.to = to;
 //    this.user = user;
 //    this.orderDatetime = orderDatetime;
 //    source = new EmailSource(defautEmailHost, defautEmailPort, defautEmaiFrom, defautEmailPassword, defautEmailDisplayName);
 //    defaultBody = createDefaultBody(user, orderDatetime);
 //}
 public EmailSender(string to, string DateOfMenu)
 {
     this.to = to;
     //this.user = user;
     this.DateOfMenu = DateOfMenu;
     source          = new EmailSource(defautEmailHost, defautEmailPort, defautEmaiFrom, defautEmailPassword, defautEmailDisplayName);
     defaultBody     = createDefaultBody(DateOfMenu);
 }
 public EmailSender setSource(EmailSource source)
 {
     this.source = source;
     return(this);
 }