how to set values in mongodb array : <blockquote>
  <p>System.NullReferenceException occurred   HResult=0x80004003<br>
  Message=Object reference not set to an instance of an object.<br>
  Source=   StackTrace:    at
  mongotest.Program.Main(String[] args) in
  C:\Users\kiit\source\repos\C#-code\mongotest\mongotest\Program.cs:line
  20</p>
</blockquote>

<p>Please help me to solve this error. Why I get the null reference. Apart from this tell me how to get data in MongoDB for this schema </p>

<pre><code>{ 

        "_id" : ObjectId("5a78a7365a98c0a0d9118c1a"), 
        "name" : "Amit", 
        "contacts" : [
            "userid1", 
            "userid2"
        ], 
        "logs" : {
            "status" : "online", 
            "Available" : "False"
        }
    }
</code></pre>

<p>Code :
how to set value for logs and contacts,I want to insert these value in database. 
What I will do with this solution: I will insert value in a database on click event in asp.net and take values from the user.</p>

<pre><code> using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using MongoDB.Bson;
    using MongoDB.Driver;
    namespace mongotest
    {
        class Program
        {
            static void Main(string[] args)
            {
                /* Connection in MongoDb and insert data in database */
                var client = new MongoClient("mongodb://localhost");
                var database = client.GetDatabase("SIH");
                var collection = database.GetCollection&lt;testing&gt;("testing");
                testing newobject = new testing();
                newobject.name = "Amit Mishra";
                newobject.logs.Available = "true";
                newobject.logs.status = "false";
                collection.InsertOneAsync(newobject);
                Console.Write("Done");
                Console.Read();
            }
        }
    }

    public class testing
    {
        public string _id { get; set; }
        public string name { get; set; }
        public string[] contacts { get; set; }
        public Logs logs { get; set; }
    }

    public class Logs
    {
        public string status { get; set; }
        public string Available { get; set; }
    }
</code></pre>
