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I have two site collections (A and B) belonging to the same content database. Inside site collection A there is a list "List1".. now i want to have the same list in the site collection B such - if there are any changes made to the list 1 in site collection A the same changes should b reflected in list1 inside site collection B - is this possible?

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up vote 1 down vote accepted

You can do it many ways:

  1. As Vardhaman suggested, use appropriate Item event handlers
  2. Using Item Created, changed, Deleted workflows
  3. Timer job which will periodically sync both lists.

Steps 2 & 3 will give control to users for manually syncying at anytime

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What kind of changes are we talking about?

If by changes you mean syncing of items, then you can simply write Item Receivers on List A for the ItemAdded, ItemDeleted and ItemUpdated events. When any of these events occur in List A, these receivers will open up SiteCollection B and inside that open up List B and do the necessary changes.

Here is a comprehensive guide on writing event receivers:

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