Consume Web service with RestSharp library using C# and VB.Net in ASP.Net

Hi Amitabha,

Check this example. Now please take its reference and correct your code.

Add the Newtonsoft and RestSharp Library reference to you project.

HTML

<asp:GridView runat="server" ID="gvDetails"></asp:GridView>

Namepsaces

C#

using Newtonsoft.Json;
using RestSharp;

VB.Net

Imports Newtonsoft.Json
Imports RestSharp

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        RestClient restClient = new RestClient("API URL");
        restClient.Timeout = -1;
        RestRequest request = new RestRequest(Method.POST);
        request.AddHeader("API-Key", "API_Key");
        request.AddHeader("Content-Type", "application/json");
        IRestResponse result = restClient.Execute(request);
        Details data = JsonConvert.DeserializeObject<Details>(result.Content);
        this.gvDetails.DataSource = data.TransactionDetails;
        this.gvDetails.DataBind();
    }
}

public class Details
{
    public int CustomerId { get; set; }
    public List<TransactionDetail> TransactionDetails { get; set; }
    public int TotalPages { get; set; }
    public int CurrentPageNumber { get; set; }
    public int NoofTxnsForEachPage { get; set; }
    public int TotalTransactions { get; set; }
    public string VehicleNumber { get; set; }
}

public class TransactionDetail
{
    public DateTime ProcessingDateTime { get; set; }
    public DateTime TransactionDateTime { get; set; }
    public decimal TransactionAmount { get; set; }
    public Int32 TransactionId { get; set; }
    public string HexTagId { get; set; }
    public string VehicleNumber { get; set; }
    public string LaneCode { get; set; }
    public string PlazaCode { get; set; }
    public string TransactionStatus { get; set; }
    public string TransactionReferenceNumber { get; set; }
    public string PlazaName { 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 restClient As RestClient = New RestClient("API URL")
        restClient.Timeout = -1
        Dim request As RestRequest = New RestRequest(Method.POST)
        request.AddHeader("API-Key", "API_Key")
        request.AddHeader("Content-Type", "application/json")
        Dim result As IRestResponse = restClient.Execute(request)
        Dim data As Details = JsonConvert.DeserializeObject(Of Details)(result.Content)
        Me.gvDetails.DataSource = data.TransactionDetails
        Me.gvDetails.DataBind()
    End If
End Sub

Public Class Details
    Public Property CustomerId As Integer
    Public Property TransactionDetails As List(Of TransactionDetail)
    Public Property TotalPages As Integer
    Public Property CurrentPageNumber As Integer
    Public Property NoofTxnsForEachPage As Integer
    Public Property TotalTransactions As Integer
    Public Property VehicleNumber As String
End Class

Public Class TransactionDetail
    Public Property ProcessingDateTime As DateTime
    Public Property TransactionDateTime As DateTime
    Public Property TransactionAmount As Decimal
    Public Property TransactionId As Int32
    Public Property HexTagId As String
    Public Property VehicleNumber As String
    Public Property LaneCode As String
    Public Property PlazaCode As String
    Public Property TransactionStatus As String
    Public Property TransactionReferenceNumber As String
    Public Property PlazaName As String
End Class