This is a rental application.

I am having trouble setting up a loop to where it keeps on sending the customer an e-mail message reminder of their past due item every day until they have returned their item.

I need a loop that runs and executes the code below and stops once the customer's Actual Check In Date is reached (ActualCheckInDate)

Here is my function code so far:

1. void emailoverduereminder.EMailOverdueReminder()
2. {
3.     // Please write your Form name here, which having record that dues deadline
4.     for each fetch_rec in Client_Listings  [(ID is not null)]
5.     {
6.         Trigger_Date = zoho.currentdate;
7.         Deadline_Date = fetch_rec.Check_IN_DUE_Date;
10.         // Please use here your form field name which contain that due date on which the email have to be triggered
11.         // checking require triggering date
12.         if (Deadline_Date  <  Trigger_Date)
13.         {
14.             sendmail
15.             (
16.                 To       :  fetch_rec.Email_Address 
17.                 From     :  zoho.adminuserid 
18.                 Subject  :  "Your Tiger Bike Is Overdue!!" 
19.                 Message  :  "<span style=\"color: rgb(51, 51, 153);\">According to our records, your Tiger Bike is overdue.  Please return your bike to the University of Memphis Bike Shop.  There is a $10.00 late fee for each day the bike is past due.<br />\n<br />\nTiger Bikes<br type=\"_moz\" />\n</span>" 
20.             )
21.             // Write your require information in the blue highlighted Email message. 
22.         }
23.     }
24. }