using System;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""Modules"": [

                {

                  ""ModuleId"": 370,

                  ""Title"": ""Getting Oriented"",

                  ""Modules"": [

                    {

                      ""ModuleId"": 378,

                      ""Title"": ""Artifacts"",

                      ""Modules"": [],

                      ""Topics"": [

                        {

                          ""TopicId"": 379

                        },

                        {

                          ""TopicId"": 380

                        },

                        {

                          ""TopicId"": 381

                        }

                      ]

                    }

                  ],

                  ""Topics"": [

                    {

                      ""TopicId"": 371

                    },

                    {

                      ""TopicId"": 372

                    },

                    {

                      ""TopicId"": 373

                    }

                  ]

                },

                {

                  ""ModuleId"": 389,

                  ""Title"": ""Build Your Solution"",

                  ""Modules"": [

                    {

                      ""ModuleId"": 390,

                      ""Title"": ""Core Platform Configuration"",

                      ""Modules"": [

                        {

                          ""ModuleId"": 392,

                          ""Title"": ""Artifacts"",

                          ""Topics"": [

                            {

                              ""TopicId"": 393

                            }

                          ]

                        }

                      ],

                      ""Topics"": [

                        {

                          ""TopicId"": 391

                        }

                      ]

                    }

                  ]

                }

              ]

            }";

​

        var jo = JObject.Parse(json);

        var topicIds = jo.Descendants()

            .OfType<JProperty>()

            .Where(p => p.Name == "TopicId" && p.Value != null)

            .ToList();

​

        foreach (var topicId in topicIds)

        {

            var moduleId = (string)topicId.Parent.Parent.Parent.Parent["ModuleId"];

            Console.WriteLine("TopicId " + topicId.Value + " -- ModuleId " + moduleId);

        }

    }

}