Updating a custom field in ItemCheckingIn event of pages library of publishing portal.

Question

I have Pages Library of publishing web. In this pages library I have a content type that has a  few custom fields.
When ever a page is created and checked in in this library I want to send out  an update email to users.  The function that sends the email returns an Id to track the mails sent.
I want to store this id to the one of the custom  fields of the content type attached to this pages library. 
If I use item checkingIn event then list item is available but when i update it gives  error probably due to the fact that in synchronous item the item is not yet created.
If i use  CheckedIn  event then it executes after the file is checked in , in that case it  gives error asking me to check  out the file first and the update the custom field.
Please  suggest the best way to update a  field in document library in synchronous event handlers or in asynchronous event handlers in the simplest of ways.
I do not want to check out the file in asynchronous event programatically for just one field and then re check it in.

Answer 1

 
Hi,
According to your post, my understanding is that you want to update list item in ItemCheckedIn method in Event Receiver.
The following code snippet for your reference:
/// <summary>
/// List Item Events
/// </summary>
public class EventReceiver1 : SPItemEventReceiver
/// <summary>
/// An item was checked in.
/// </summary>
public override void ItemCheckedIn(SPItemEventProperties properties)
SPListItem item = properties.ListItem;
item["Title"] = "Test1";
item.Update();
If the issue still exists, I suggest you debug your code or provide your code for further research.
http://sharepoint-kings.blogspot.com/2013/02/debugging-event-receivers-in-sharepoint.html
Thanks,
Dennis Guo
TechNet Community Support
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Dennis Guo
TechNet Community Support