Windows Mobile - Connect to Internet

My application is making call to server at regular intervals. This requires internet connection either using Wi-Fi or GPRS.

This works ok when phone is waken (screen light is on). But, as soon as phone lights are off, it makes HttpWebRequest and tried to get Internet connection. Mobile starts connecting to Wi-Fi. But, Application does not wait for establishing co开发者_StackOverflownnection to Wi-Fi.

1. How can I connect to Wi-Fi or GPRS before making HttpWebRequest?
2. How to specify that I want to connect to Wi-Fi or GPRS?

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I think their are two approaches to do:

1. You can create a thread and do sleep/resume activity you want.
2. you can use set timer for particular interval.