using System;

using Newtonsoft.Json;

​

public class Example

{

    public TimeSpan StartTime { get; set; }

    public TimeSpan EndTime { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var test = "{\"StartTime\": \"10:48:32\",\"EndTime\": \"11:48:32\" }";

        var example = Newtonsoft.Json.JsonConvert.DeserializeObject<Example>(test);

        Console.WriteLine(example.StartTime);       

        Console.WriteLine(example.EndTime);

​

    }

}