MIdhun,

 

Please download http://cutesoft.net/downloads/folders/chat_current_releases/entry44845.aspx

 

And check the integration code of this project.

 

It shows you how to add contact and how to remove contact.

 

            public override void AddContact(ChatIdentity identity, string userid)
            {
                lock (this.Portal)
                {
                    ChatProvider provider = ChatProvider.GetInstance(this.Portal);
                    string username = provider.FromUserId(identity.UniqueId);
                    CommunityServer.Components.User user = CommunityServer.Users.GetUser(0, username, false, true);
                    if (user == null) return;
                    string targetname = provider.FromUserId(userid);
                    CommunityServer.Components.User target = CommunityServer.Users.GetUser(0, targetname, false, true);
                    if (target == null) return;
                    CommunityServer.Components.Friendships.InsertFriendship(user.UserID, target.UserID, "added by messenger", CommunityServer.Components.FriendshipState.Approved);
                    this.OnContactAdded(identity, userid);
                }
            }
            public override void RemoveContact(ChatIdentity identity, string userid)
            {
                lock (this.Portal)
                {
                    ChatProvider provider = ChatProvider.GetInstance(this.Portal);
                    string username = provider.FromUserId(identity.UniqueId);
                    CommunityServer.Components.User user = CommunityServer.Users.GetUser(0, username, false, true);
                    if (user == null) return;
                    string targetname = provider.FromUserId(userid);
                    CommunityServer.Components.User target = CommunityServer.Users.GetUser(0, targetname, false, true);
                    if (target == null) return;
                    CommunityServer.Components.Friendship friend=CommunityServer.Components.Friendships.GetFriendship(user.UserID, target.UserID, false);
                    if (friend == null) return;
                    CommunityServer.Components.Friendships.DeleteFriendship(friend);
                    this.OnContactRemoved(identity, userid);
                }
            }