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Can i use autonumber as External ID.?

Hello Dear,
As we all knew that people are talking Number,Eail,Text is use for External ID.
but i found one option that we can use auto number as Extenal ID.Please Clarify me this.
Deepak BalurDeepak Balur
Can you please clarify what you mean?
Vishnu VaishnavVishnu Vaishnav
Hi ,

Yes we can do this .

Qusetion Solved ? then mark as best answer to make helpful to others .....
Hello Vishnu  thanks.

As i knew that people mostly talking that Emai,number,Text Can use as ExternalID.in dump question this 3 are only answer why they skiping Autonumber as ExternalID.

I know the answer to your question. Look at this topic: https://developer.salesforce.com/forums?id=906F00000009CUSIA2.

Actually, per documentation, Email, Number, Text, AutoNumber can be set as ExternalID. However, in real situation, if you wanted to upsert some data using dataloader you cannot user AutoNumber as ExternalId. So, this means that AutoNumber despite being declared as ExternalId, is not always completely functional ExternalId like in upsert case for dataloader.