C# How to increase the HttpWebRequest timeout

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C#2.0

C#

HTTP

WiFi

Hi,

I am trying to fetch some data from a device using my application, using a webservice.
I am using HttpWebRequest object to get the data from my service... everything works well until the response is received within 60 secs, but when the device takes more than 60 secs to respond then GetResponse callback fires a duplicate request.

But if service returns data before 60 seconds then it works....

Note: i have already tried to set the timeout to 200 seconds
request.Timeout = 200000;
Still this doesn't work out.

did anybody faces any issue like this before???
Please help
Dinesh.