PrepareBoxUser

       public static async Task PrepareBoxAppUser(ClaimsIdentity externalIdentity)
        {
            var auth0UserId = externalIdentity.Claims.FirstOrDefault(c => c.Type == "user_id").Value;
             
            var boxId = GetBoxIdFromAuth0(auth0UserId);
            
            if (boxId == null)
            {
                
                //create a new app user in Box
                string email = externalIdentity.Claims.FirstOrDefault(c => c.Type == "email").Value;
                string name = email;
                if (email.Equals("[email protected]"))
                {
                    name = "Test Client1";
                }
                else if(email.Equals("[email protected]"))
                {
                    name = "Test Client2";
                }
                var userRequest = new BoxUserRequest() { Name = name, IsPlatformAccessOnly = true };
                var appUser = await AdminClient().UsersManager.CreateEnterpriseUserAsync(userRequest);
                boxId = appUser.Id;

                //store the boxId in the user's Auth0 metadata
                var meta = new Dictionary<string,object>();
                meta.Add(BOX_USER_ID_KEY,boxId);
                AUTH0_CLIENT.UpdateUserMetadata(auth0UserId, meta);

                //now do the initial box account setup
                var boxClient = UserClient((string)boxId);
                var folderRequest = new BoxFolderRequest() { Name = name + " Docs", Parent = new BoxRequestEntity() { Id = "0" } };
                var sharedFolder = await boxClient.FoldersManager.CreateAsync(folderRequest);

                folderRequest = new BoxFolderRequest() { Name = "Private", Parent = new BoxRequestEntity() { Id = "0" } };
                var privateFolder = await boxClient.FoldersManager.CreateAsync(folderRequest);

                //Create Groups
                var bgr = new BoxGroupRequest() { Name = name + " Advisor Group" };
                var group = await AdminClient().GroupsManager.CreateAsync(bgr);

                //Create Colaboration
                var bcur = new BoxCollaborationUserRequest() { Id = group.Id, Type = BoxType.group };
                var bcr = new BoxCollaborationRequest()
                {
                    AccessibleBy = bcur,
                    Item = new BoxRequestEntity() { Id = sharedFolder.Id, Type = BoxType.folder },
                    Role = "viewer uploader"
                };
                var colaboration = await boxClient.CollaborationsManager.AddCollaborationAsync(bcr);

                //Add Advisor 1 to Group
                var bgr2 = new BoxGroupRequest() { Id= group.Id };
                var bre = new BoxRequestEntity() { Id = advisor1id };
                var gmr = new BoxGroupMembershipRequest() {  Group = bgr2, User = bre };
                var membership = await AdminClient().GroupsManager.AddMemberToGroupAsync(gmr);


                    //var pathToFile = HttpContext.Current.Server.MapPath("~/Assets/");
                    //var fileName = "test.txt";
                    //using (FileStream fs = File.Open(pathToFile + fileName, FileMode.Open))
                    //{
                    //    // Create request object with name and parent folder the file should be uploaded to
                    //    BoxFileRequest request = new BoxFileRequest()
                    //    {
                    //        Name = fileName,
                    //        Parent = new BoxRequestEntity() { Id = "0" }
                    //    };
                    //    var boxFile = await boxClient.FilesManager.UploadAsync(request, fs);
                    //}
                }
            
            HttpContext.Current.Session[BOX_USER_ID_KEY] = (string)boxId;