Calling Web API Using HttpWebRequest In C#

Step 1

Create Asp.Net Project.

Step 2

Add Web Form GetAreaPostOffice.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GetAreaPostOffice.aspx.cs" Inherits="GetPostOfficeNameByPinCode.GetAreaPostOffice" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
<asp:Label ID="lblPinCode" Text="Area Pin Code : " runat="server"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtPinCode" runat="server" Width="200" MaxLength="6" onkeypress='return event.charCode >= 48 && event.charCode <= 57'></asp:TextBox>
</td>
<td>
<asp:Button ID="btnSearch" Text="Search" runat="server" OnClick="btnSearch_Click" Enabled="true" />
</td>
</tr>
<tr>
<td colspan="5">
<asp:Label ID="lblMessage" Text="" runat="server"></asp:Label>
</td>
</tr>
</table>
</div>
<div>
<asp:GridView ID="grdAreaPostOffice" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None">
<AlternatingRowStyle BackColor="White" />
<FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
<RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
<SortedAscendingCellStyle BackColor="#FDF5AC" />
<SortedAscendingHeaderStyle BackColor="#4D0000" />
<SortedDescendingCellStyle BackColor="#FCF6C0" />
<SortedDescendingHeaderStyle BackColor="#820000" />
</asp:GridView>
</div>
</form>
</body>
</html>

Step 3

Write the code in the code behind file like this.

using LitJson;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace GetPostOfficeNameByPinCode
{
public partial class GetAreaPostOffice : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSearch_Click(object sender, EventArgs e)
{
PostOfficeResult postOfficeResult = null;
try
{
string userAuthenticationURI = "http://postalpincode.in/api/pincode/" + txtPinCode.Text.Trim();
if (!string.IsNullOrEmpty(userAuthenticationURI))
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(userAuthenticationURI);
request.Method = "GET";
request.ContentType = "application/json";
WebResponse response = request.GetResponse();
using (var reader = new StreamReader(response.GetResponseStream()))
{
var ApiStatus = reader.ReadToEnd();
JsonData data = JsonMapper.ToObject(ApiStatus);
string status = data["Status"].ToString();
if (status.ToLower() == "success")
{
postOfficeResult = JsonMapper.ToObject<PostOfficeResult>(ApiStatus);
}
if (postOfficeResult != null)
{
grdAreaPostOffice.DataSource = postOfficeResult.PostOffice;
grdAreaPostOffice.DataBind();
}
else
{
lblMessage.Text = data["Message"].ToString();
}
}
}
}
catch
{
}
}
}
}