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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js "></script>
<script type="text/javascript">
$(document).ready(function () {
$.ajax({
type: "POST",
contentType: "application/json;charset=utf-8",
url: "Default.aspx/DisplayData",
data: '{}',
dataType: "json",
success: function (data) {
$("#lbltxt").text(data.d);
},
error: function (result) {
alert("Error");
}
});
});
</script>

</head>
<body>
<form id="form1" runat="server">
<div>
<label id="lbltxt" runat="server"></label>
</div>
</form>
</body>
</html>

//copy into Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using System;
using System.Net;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
[WebMethod]
public static string DisplayData()
{
return "hostname: " + Dns.GetHostName();
}
}