Connect to sharepoint webservices

Webservice url :  /en/news/_vti_bin/Lists.asmx Code:
Lists ws = new WS.Lists();
 NetworkCredential credential = new NetworkCredential("username","password","domain.com");
ws.Credentials = credential;

ws.Proxy = System.Net.WebProxy.GetDefaultProxy();
//ws.Credentials = System.Net.CredentialCache.DefaultCredentials;
// myProxy.Credentials = new NetworkCredential("username", "password", "mof.ae");
// ws.Proxy = myProxy;
// XmlNode node = ws.GetView("Pages", "{C3F92D7E-9CD2-41C3-8D1C-EC3874E67E3F}");
 
XmlNode node = ws.GetListItems("{3CB1772E-3A70-419C-XXXX-1DBA9710B8CB}", "{C3F92D7E-XXXX-41C3-XXXX-EC3874E67E3F}",null,null,"5",null,"");