public Task<GridFSDownloadStream<TFileId>> OpenDownloadStreamByNameAsync(
	string filename,
	GridFSDownloadByNameOptions options = null,
	CancellationToken cancellationToken = null
)

Public Function OpenDownloadStreamByNameAsync ( 
	filename As String,
	Optional options As GridFSDownloadByNameOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of GridFSDownloadStream(Of TFileId))

abstract OpenDownloadStreamByNameAsync : 
        filename : string * 
        ?options : GridFSDownloadByNameOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<GridFSDownloadStream<'TFileId>> 
override OpenDownloadStreamByNameAsync : 
        filename : string * 
        ?options : GridFSDownloadByNameOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<GridFSDownloadStream<'TFileId>>