Hi counterkin,

In order to parse the Json create class and Deserialize using Newtonsoft library.

Please refer below sample.

Namespaces

C#

using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

VB.Net

Imports System.IO
Imports Newtonsoft.Json
Imports Newtonsoft.Json.Linq

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string path = Server.MapPath("~/Files/jsonString.txt");
        string jsonString = File.ReadAllText(path);
        Root jsonArray = Newtonsoft.Json.JsonConvert.DeserializeObject<Root>(jsonString);
    }
}

public class DropoffPoint
{
    public string point_id { get; set; }
    public string point_name { get; set; }
    public string point_contact { get; set; }
    public string point_addr1 { get; set; }
    public string point_addr2 { get; set; }
    public string point_addr3 { get; set; }
    public string point_addr4 { get; set; }
    public string point_postcode { get; set; }
    public string point_city { get; set; }
    public string point_state { get; set; }
    public string start_time { get; set; }
    public string end_time { get; set; }
    public int price { get; set; }
}

public class PgeonPoint
{
    public List<SenderPoint> Sender_point { get; set; }
    public List<ReceiverPoint> Receiver_point { get; set; }
}

public class Rate
{
    public string rate_id { get; set; }
    public string service_detail { get; set; }
    public string service_id { get; set; }
    public string service_type { get; set; }
    public string courier_id { get; set; }
    public string courier_logo { get; set; }
    public string scheduled_start_date { get; set; }
    public string pickup_date { get; set; }
    public string delivery { get; set; }
    public string price { get; set; }
    public string addon_price { get; set; }
    public string shipment_price { get; set; }
    public int require_min_order { get; set; }
    public string service_name { get; set; }
    public string courier_name { get; set; }
    public List<DropoffPoint> dropoff_point { get; set; }
    public List<object> pickup_point { get; set; }
}

public class ReceiverPoint
{
    public string point_id { get; set; }
    public string company { get; set; }
    public string point_name { get; set; }
    public string point_contact { get; set; }
    public string point_lat { get; set; }
    public string point_lon { get; set; }
    public string point_addr1 { get; set; }
    public string point_addr2 { get; set; }
    public string point_addr3 { get; set; }
    public string point_addr4 { get; set; }
    public string point_city { get; set; }
    public string point_state { get; set; }
    public string point_postcode { get; set; }
    public string price { get; set; }
}

public class Result
{
    public string REQ_ID { get; set; }
    public string status { get; set; }
    public string remarks { get; set; }
    public List<Rate> rates { get; set; }
    public PgeonPoint pgeon_point { get; set; }
}

public class Root
{
    public string api_status { get; set; }
    public string error_code { get; set; }
    public string error_remark { get; set; }
    public List<Result> result { get; set; }
}

public class SenderPoint
{
    public string point_id { get; set; }
    public string company { get; set; }
    public string point_name { get; set; }
    public string point_contact { get; set; }
    public string point_lat { get; set; }
    public string point_lon { get; set; }
    public string point_addr1 { get; set; }
    public string point_addr2 { get; set; }
    public string point_addr3 { get; set; }
    public string point_addr4 { get; set; }
    public string point_city { get; set; }
    public string point_state { get; set; }
    public string point_postcode { get; set; }
    public string price { get; set; }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim path As String = Server.MapPath("~/Files/jsonString.txt")
        Dim jsonString As String = File.ReadAllText(path)
        Dim jsonArray As Root = Newtonsoft.Json.JsonConvert.DeserializeObject(Of Root)(jsonString)
    End If
End Sub

Public Class DropoffPoint
    Public Property point_id As String
    Public Property point_name As String
    Public Property point_contact As String
    Public Property point_addr1 As String
    Public Property point_addr2 As String
    Public Property point_addr3 As String
    Public Property point_addr4 As String
    Public Property point_postcode As String
    Public Property point_city As String
    Public Property point_state As String
    Public Property start_time As String
    Public Property end_time As String
    Public Property price As Integer
End Class

Public Class PgeonPoint
    Public Property Sender_point As List(Of SenderPoint)
    Public Property Receiver_point As List(Of ReceiverPoint)
End Class

Public Class Rate
    Public Property rate_id As String
    Public Property service_detail As String
    Public Property service_id As String
    Public Property service_type As String
    Public Property courier_id As String
    Public Property courier_logo As String
    Public Property scheduled_start_date As String
    Public Property pickup_date As String
    Public Property delivery As String
    Public Property price As String
    Public Property addon_price As String
    Public Property shipment_price As String
    Public Property require_min_order As Integer
    Public Property service_name As String
    Public Property courier_name As String
    Public Property dropoff_point As List(Of DropoffPoint)
    Public Property pickup_point As List(Of Object)
End Class

Public Class ReceiverPoint
    Public Property point_id As String
    Public Property company As String
    Public Property point_name As String
    Public Property point_contact As String
    Public Property point_lat As String
    Public Property point_lon As String
    Public Property point_addr1 As String
    Public Property point_addr2 As String
    Public Property point_addr3 As String
    Public Property point_addr4 As String
    Public Property point_city As String
    Public Property point_state As String
    Public Property point_postcode As String
    Public Property price As String
End Class

Public Class Result
    Public Property REQ_ID As String
    Public Property status As String
    Public Property remarks As String
    Public Property rates As List(Of Rate)
    Public Property pgeon_point As PgeonPoint
End Class

Public Class Root
    Public Property api_status As String
    Public Property error_code As String
    Public Property error_remark As String
    Public Property result As List(Of Result)
End Class

Public Class SenderPoint
    Public Property point_id As String
    Public Property company As String
    Public Property point_name As String
    Public Property point_contact As String
    Public Property point_lat As String
    Public Property point_lon As String
    Public Property point_addr1 As String
    Public Property point_addr2 As String
    Public Property point_addr3 As String
    Public Property point_addr4 As String
    Public Property point_city As String
    Public Property point_state As String
    Public Property point_postcode As String
    Public Property price As String
End Class

Screenshot