Getting userId and Information

CrmService _service = new CrmService();

CrmAuthenticationToken token = new CrmAuthenticationToken();

token.OrganizationName = orgName;

token.AuthenticationType = AuthenticationType.AD;

_service.Url = "http://localhost:5555/MSCRMServices/2007/crmservice.asmx";

_service.CrmAuthenticationTokenValue = token;

//_service.Credentials = new System.Net.NetworkCredential() { UserName = "username", Password = "password" };

_service.Credentials = System.Net.CredentialCache.DefaultCredentials;

WhoAmIRequest req = new WhoAmIRequest();

WhoAmIResponse res = (WhoAmIResponse)_service.Execute(req);

Guid userID= res.UserId;

After getting UserId get the whole information by TargetRetrieved or Query;