Collection UpsertAsync success

.NET SDK
1

When we perform

   await collection.UpsertAsync()

we get

MutationResult()

From current documentation it is not quite clear what is CAS. Can it be used as fail/success flag for upsert? if yes, what is the value for fail?
If no, how can we identify success/fail for upsert?
Thank you

2

SDK 3 uses exceptions for error cases, so as long as there are no exceptions then it was successful. CAS is the Check-And-Set Compare-and-Swap, which is used when reading and then mutating a document to ensure it wasn’t changed between the read and the mutate.

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