using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

var json = @"[

{

    ""ID"": 1,

    ""Namn"": ""Conference Microsoft"",

    ""StartDatum"": ""2017-11-15T10:00:00"",

    ""SlutDatum"": ""2017-11-15T12:00:00"",

    ""KonferensID"": null

},

{

    ""ID"": 2,

    ""Namn"": ""föreläsning"",

    ""StartDatum"": null,

    ""SlutDatum"": null,

    ""KonferensID"": null

}

]";

        var conferences = JsonConvert.DeserializeObject<List<Conference>>(json);

        Console.WriteLine(conferences[0].StartDatum);

    }

    public class Conference

    {

    public int ID { get; set; }

    public string Namn { get; set; }

    public DateTime? StartDatum { get; set; }

    public DateTime? SlutDatum { get; set; }

    public object KonferensID { get; set; }

    }

}