IP address changing tool

I am looking for a c# vs2005 class which I can use to change ip address dynamically.? I have an application which makes heavy use of internet (httpwebrequest and httpwebresponse objects), and I want to be able to change ip address to maintain anonymity during my calls. You will provide class which does this and also the sample as to how to use that class.? In your sample, you will call [[login to view URL]][1] (or some other site), 1000 times and the class should change ip address after certain time or something.