using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string json =@"{ ""users"": {

            ""xyz "": {

              ""Name"": ""abc "",

            },

            ""x "": {

              ""Name"": ""xy "",

            },

            ""abc"": {

              ""Name"": ""ijk"",

            },}}";

        JObject obj = JObject.Parse(json);

        JObject users = (JObject)obj["users"];

        List<string> keys = users.ToObject<Dictionary<string, object>>()

            .Keys

            .ToList();

        Console.WriteLine(String.Join(Environment.NewLine, keys));

    }

}