WriteConcernResult Properties | 
The WriteConcernResult type exposes the following members.
| Name | Description | |
|---|---|---|
| DocumentsAffected | 
            Gets the number of documents affected.
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| HasLastErrorMessage | 
            Gets whether the result has a LastErrorMessage.
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| LastErrorMessage | 
            Gets the last error message (null if none).
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| Response | 
            Gets the wrapped result.
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| UpdatedExisting | 
            Gets whether the last command updated an existing document.
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| Upserted | 
            Gets the _id of an upsert that resulted in an insert.
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