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I am building an app where I need to store the Sharepoint Entities locally. Which of the following Ids is best suited for such scenarios?

  1. GUID.
  2. Unique Id.
  3. Id.
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It depends on your scenario:

  1. Unique ID / GUID - is unique GUID that identifies an item in SharePoint content database, but using SharePoint API you cannot find item using this GUID.
  2. Id - is item ID in SharePoint list/library, that is integer value and is incremental.

Usually, when you want to uniquely identify list item in SharePoint you should use this set of properties:

  1. Web Url - string
  2. List ID - GUID
  3. Item ID - integer

Having these 3 properties, you can easily identify and get any SharePoint list item in whole SharePoint Farm, using server side API, client side API or REST Web Services.

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