public Task<GridFSUploadStream<TFileId>> OpenUploadStreamAsync(
	TFileId id,
	string filename,
	GridFSUploadOptions options = null,
	CancellationToken cancellationToken = null
)

Public Function OpenUploadStreamAsync ( 
	id As TFileId,
	filename As String,
	Optional options As GridFSUploadOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of GridFSUploadStream(Of TFileId))

abstract OpenUploadStreamAsync : 
        id : 'TFileId * 
        filename : string * 
        ?options : GridFSUploadOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<GridFSUploadStream<'TFileId>> 
override OpenUploadStreamAsync : 
        id : 'TFileId * 
        filename : string * 
        ?options : GridFSUploadOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<GridFSUploadStream<'TFileId>>