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I have noticed that many examples of internet which show creating the list definition have a GUID in the id of the field. How is this ID got? e.x.

Where is this GUID got from?

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Oh really, I didn' know that It was so simple. thanks – user9878 Aug 4 '12 at 17:22

Usually in Visual Studio; Tools -> Generate GUID

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While each generated GUID is not guaranteed to be unique, the total number of unique keys (2^128 or 3.4×10^38) is so large that the probability of the same number being generated twice is very small. For example, consider the observable universe, which contains about 5×10^22 stars; every star could then have 6.8×10^15 universally unique GUIDs.

For more information:

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Go to the list settings page. Right click on "Title, description and navigation" and copy the URL. Paste that into notepad and copy everything after "List=" in the string. That's your URL Encoded GUID for the list. All you need to do is decode it here

source: Get a SharePoint List GUID from the Browser

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