How to interact with sites in wp7?

Question

I need to send and receive get post requests

Answer 1

You would use the HttpWebRequest / HttpWebResponse classes or simpler requirements can be fulfilled with WebClient. The HTTP Communication and Security with Silverlight topic on MSDN covers the basics.

Note that Windows Phone 7 is basically Silverlight 3 not 4 especially when it comes to networking capabilities. The Networking in Silverlight for Windows Phone topic is also worth reading.