asp.net send the response about 15 minute - asp.net

Question

i want when the client send to my web page request,my web page get the request and active timer and wait about 15 minute and check client so connect and response the json string.
my server code is:
string name, count;
protected void Page_Load(object sender, EventArgs e)
{
name = Request.QueryString["name"];
count = Request.QueryString["count"];
Timer1.Interval = 15000;
Timer1.Enabled = true;
}
protected void Timer1_Tick(object sender, EventArgs e)
{
if (Response.IsClientConnected)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
string json=jss.Serialize("در خواست شما تایید شد");
Response.Clear();
Response.Write(json);
Response.End();
}
else
{
Response.End();
}
}
how can i do this?

Answer 1

From your comment : " thanks,i want for example customer send my server a order and when the system manager accept the order,response to client:your order accepted"
You will need to include jQuery to do this bit.
As you have the name and count in the query string, which I take it will help you identify the customer (or change it to an order ID), then you can use the following on your .aspx page in a javascript block:
$(document).ready(function(){
setTimeout(function()
{
location.reload();
}, (15 * 60 * 1000)); // (that's 15 mins that I couldn't be bothered to work out...)
});
Your server side code could then be:
protected void Page_Load(object sender, EventArgs e)
{
var name = Request.QueryString["name"];
var count = Request.QueryString["count"];
if(OrderAccepted(name, count))
{
// display message to user
}
}
private bool OrderAccepted(string name, string count)
{
// do what you need to do to find out if the order is accepted.
}
You may also want to try and have the javascript only run if the order is not accepted so that it doesn't keep running. But a 15 min interval is a decent long period, and most people will close their browsers once they know the order is accepted.
Hope this helps.

Answer 2

You cannot achieve what you are trying to do through "only" server-side (compiled C#) code.
The problem is that you want the client to send a request every fifteen minutes - to get the latest JSON - but you are trying to tell the server to do that.
There are many better ways to accomplish what you are trying to do (ie, better than a fifteen-minute timer) but here is one way you can achieve that through JavaScript:
First, expose your server's API call (the call that gets the JSON).
Then, in a script node on the client (ie in a script tag in the HTML you send down), define the following function:
function refreshDataAndUpdatePage() {
$.ajax({
url: 'your/url/to/the/action',
success: function (data) {
// use data JSON to update page.
// then, call this function again recursively after a timeout of 15 minutes = 900 s = 900,000 ms
setTimeout(refreshDataAndUpdatePage, 900000);
}
}
And of course, call it somewhere.