webproxy problem

Question

Hi,what is the different between Webproxy and Iwebproxy??
I am in syrial but
and when I use this code:

                        HttpWebRequest myWebRequest=(HttpWebRequest)WebRequest.Create(url);
                        myWebRequest.Proxy=WebRequest.GetSystemWebProxy();
                        HttpWebResponse myWebResponse=(HttpWebResponse)myWebRequest.GetResponse();
			Stream stream=myWebResponse.GetResponseStream();
			StreamReader sreader=new StreamReader(stream);
			StreamWriter write=new StreamWriter("/home/abulwleed/Desktop/empty.html");
                        write.WriteLine(sreader.ReadToEnd());
	        	myWebResponse.Close();
			write.Close();
			sreader.Close(); 

whin I open the saved page It'll be google page but not out(in syrial) server
it's Deutschland google server it is as i used a proxy but as you see in the code i use the system proxy and it's default (ISP proxy)
it is not just for google happend .it is for all sites.
pleas report what is the problem..


another little quistion :
when i write this code:

string ipproxy="proxy.kalamoon.edu.sy";
int port=3128;
WebProxy proxy = new WebProxy(ipproxy,port);
Uri url=new Uri("http://www.google.com/");
HttpWebRequest myWebRequest=(HttpWebRequest)WebRequest.Create(url);
myWebRequest.Proxy=proxy;

it this the right code to change my software proxy??
and surf using other than my isp proxy?


thanx a lot