Re: Notifying a user on demand

[Steven Cheng [MSFT]]

Hi Nick,

From the description in your first message, I think what you want to do the
let the webservice server-side proactively notify the webservice client for
some changing, correct?

I'm afraid this is quite difficult as the webservice by default is used as
the client calls the server for information modal. The server-side doesn't
have any channel to send client-side informaton on the fly. Unless your
webservice client is also a service host which will listening on a certain
port(or host a certain webservice) to let the server-side invoke.

For such kind of "server to client" notification in http based stateless
environment, the most common way is still using a polling approach to
constantly check the server-side status.

Please feel free to post here if you have any other ideas or concerns.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead
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--------------------

>From: "Nick" <[e-mail]>
References: <O1*************@TK2MSFTNGP04.phx.gbl>

<01**********************************@microsoft.co m>

>Subject: Re: Notifying a user on demand
Date: Tue, 8 Jul 2008 15:27:34 +0100

>
Hi Patrice,

The site is for public usage. One reason I mention the capability of
being able to log off the user on-demand would be that it would just mean
that it would be technically possible for me to process any other code,

the

>logging off on-demand isn't so important, just the practice behind it.

What i'm trying to do is enable a webservice to have extra control

over

>the logged on user so that I can provide some extra functionality that

isn't

>currently possible using the standard principals. I'm a little worried
about polling as I'm not sure what impact that would have with 100+ users
polling for notifications at the same time, and of course the delay

between

>a notification being sent and recieved.

Of course I might be being a tad too over cautious.

Thanks a million for your feedback, I hadn't thought of silverlight as

a

>possible solution, that could help with a number of issues...

Nick.

"Patrice" <http://www.chez.com/scribe/wrote in message
news:01**********************************@microso ft.com...

>As mosft often knowing the context could help. Is this for general

public

>or in a controlled environment ?

Depending on the context you could also explore using the "net send"
service, SilverLight, or an instant messaging API ?? If you need to

stick

>to a basic browser then you'll have likely no other choice than

polling...

>>
For logging off a flag that would log them off on the next request