Replaces a document for a given key if it exists, otherwise fails.
Namespace: Couchbase.CoreAssembly: Couchbase.NetClient (in Couchbase.NetClient.dll) Version: 2.0.0.0 (2.0.0.0)

Parameters
- key
- Type: System.String
The unique key for indexing.
- value
- Type: T
The value for the key.
- cas
- Type: System.UInt64
The CAS (Check and Set) value for optimistic concurrency.
- expiration
- Type: System.TimeSpan
The time-to-live (ttl) for the key.
- replicateTo
- Type: Couchbase.ReplicateTo
The durability requirement for replication.
- persistTo
- Type: Couchbase.PersistTo
The durability requirement for persistence.

- T
- The Type of the value to be inserted.
Return Value
Type: IOperationResult<T>An object implementing the IOperationResult<T>interface.
