How to get TFS Project groups and members information using TFS2010 APIs ?

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using Microsoft.TeamFoundation.Client;

using Microsoft.TeamFoundation.Server;

using Microsoft.TeamFoundation.VersionControl.Client;

 

public void PrintTFSGroupMembersInfo()

        {

            TfsTeamProjectCollection proj_coll = new TfsTeamProjectCollection(new Uri("http://NvnTFSServer:8080/tfs/defaultcollection/"), new System.Net.NetworkCredential(username, pass));

            proj_coll.Authenticate();

            VersionControlServer vcs = (VersionControlServer)proj_coll.GetService(typeof(VersionControlServer));

            TeamProject[] TPs = vcs.GetAllTeamProjects(false);

            IGroupSecurityService sec_groups = (IGroupSecurityService)proj_coll.GetService(typeof(IGroupSecurityService));

            foreach (TeamProject TP in TPs)

            {

                Console.WriteLine("Team Project : " + TP.Name);

                Console.WriteLine("Group Members : ");

                Identity[] app_groups = sec_groups.ListApplicationGroups(TP.ArtifactUri.ToString());

                foreach (Identity app_grp in app_groups)

                {

                    Identity grp = sec_groups.ReadIdentity(SearchFactor.Sid, app_grp.Sid, QueryMembership.Direct);

                    foreach (string members in grp.Members)

                    {

                        Identity member = sec_groups.ReadIdentity(SearchFactor.Sid, members, QueryMembership.Direct);

                        Console.WriteLine("     " + member.DisplayName);

                        foreach (string mm in member.Members)

                        {

                            Identity m = sec_groups.ReadIdentity(SearchFactor.Sid, mm, QueryMembership.Direct);

                            Console.WriteLine("         " + m.DisplayName);

                        }

                    }

                }

            }

        }