public Dictionary <int, VkWall> GetWallsForFriendsInUserGraph(List <VkUser> listGroupMembers) { var userWallDictionary = new Dictionary <int, VkWall>(); foreach (var groupMember in listGroupMembers) { foreach (var friend in groupMember.FriendsList) { var friendWall = new VkWall(); if (!userWallDictionary.ContainsKey(friend.Id) && friendWall.GetTopPosts(friend, 10)) { userWallDictionary.Add(friend.Id, friendWall); } } } return(userWallDictionary); }