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i want to send the server event(push notificaton) to specific users(based on their usernames) any idea how to do it?
Updated 16-Jun-12 21:46pm
bbirajdar 16-Jun-12 16:08pm    
Not clear....
agha_ali22 17-Jun-12 3:13am    
i have an aspx page which send notification to connected clients (connected by Html5 event source) and now i wanted to send notification to a specific username which i have saved in session or in some scenario i want to send notification to a group which is also saved in session as groupid(admin(1),manager(2),e.t.c)

HTTP works in disconnected mode. The server does not remember its clients.

You should implement server polling from client side scripting[^][^][^]
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agha_ali22 18-Jun-12 5:24am    
what i want is to notify a group of clients that something happened , now i can notify all the connected clients what i want is notify a group

Here is the Default.aspx file<script type="text/javascript">

window.onload = function () {
if (window.EventSource == undefined) {
document.getElementById('targetDiv').innerHTML = "Your browser doesn't support Server Side Events.";
var source = new EventSource('SSEHandler.aspx');

source.onopen = function (event) {
document.getElementById('targetDiv').innerHTML += 'Connection Opened.<br>';

source.onerror = function (event) {
if (event.eventPhase == EventSource.CLOSED) {
document.getElementById('targetDiv').innerHTML += 'Connection Closed.<br>';

source.onmessage = function (event) {

<div id="targetDiv">

and here is 'SSEHandler.aspx' cs

protected void Page_Load(object sender, EventArgs e)

Response.ContentType = "text/event-stream";

while (true)

Response.Write(string.Format("data: {0}\n\n","Hello"));

now i want to send the response to the desired user. this can be done by long pooling but i want to do with html5 Server sent event any idea?
bbirajdar 18-Jun-12 6:02am    
The reverse is not possible because of the stateless architecture of the HTTP. Polling is the only option as far as I know..
agha_ali22 18-Jun-12 6:40am    
Server Side Events is a more basic way to send one way data from the server to the client. It works like a long request from the clients JavaScript function where data can is returned bit by bit during the response and each time a bit is returned a JavaScript event is triggered.
SSE broadcasts to all open connections. Include your group in your JSON stream and do the group check in the javascript.

Note : This is not a secure method, do not use sensitive data this way, since everyone gets every single message, it'll only be handled by your javascript differently.

Example :

Server-Side C#
string JSON = "data: {'IntendedFor' = 'AdminClerks', 'Message' = 'You\'ve got a server event'}";

Client HTML
<input id='myGroup' type='hidden' value='AdminClerk' />

Client Javascript
var myGroup = document.GetElementById('myGroup').value;
var source = new EventSource('<insert url="" here="">');
source.onmessage = function (e) {
  var myJSONResponse = JSON.parse(;
  if (myJSONResponse.IntendedFor == myGroup)
    alert("You've got a server event");
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agha_ali22 16-Apr-13 12:25pm    
Now I am using SignalR which exactly do what i want,but as my question was concerned your answer is correct
D Hinterlang 17-Apr-13 3:40am    
I'm also using SignalR :) Really awesome framework for doing exactly this sort of thing.

Thanks for solution accept :) It's how I was doing it before I moved to SignalR.

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