JavaScriptSerializer is situated in System.Web.Extensions Assembly. You should add it to your project references using add reference option.

using System.Net;
using System.Text;
using System.IO;
using System.Data;
using System.Web.Script.Serialization;

string json = new JavaScriptSerializer().Serialize(new
{
empid = eid,
empname = ename,
empsalary = salary
});

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Text;
using System.IO;
using System.Data;
using System.Web.Script.Serialization;

 

string url =”http://abc.com”;

var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentType = “application/json”;
httpWebRequest.Method = “POST”;

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = new JavaScriptSerializer().Serialize(new
{
empid = “1001”,
empname = “test name”,
empsalary= “10000”
});

streamWriter.Write(json);
}

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}

function printpage() {
//Get the print button and put it into a variable
var printButton = document.getElementById(“printbtn”);
//Set the print button visibility to ‘hidden’
printButton.style.visibility = ‘hidden’;
//Print the page content
window.print()
//Set the print button to ‘visible’ again
//[Delete this line if you want it to stay hidden after printing]
printButton.style.visibility = ‘visible’;
}

 

<input id=”printbtn” type=”button” value=”Print page” onclick=”printpage()”/>

 

Add below mention assembly in your project.

using System.Net;
using System.Text;

try

{

WebClient myClient = new WebClient();

string myPageHTML = null;

byte[] requestHTML;

string currentPageUrl = “https://abcd1212.com/webpage.aspx&#8221;;

UTF8Encoding utf8 = new UTF8Encoding();

requestHTML = myClient.DownloadData(currentPageUrl);

myPageHTML = utf8.GetString(requestHTML);

Response.Write(myPageHTML);

}

catch (Exception ex)

{

}

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<html>
<head>
http://../JQuery/jquery-1.7.2.js

$(document).ready(function () {
$(‘#txtPassword’).keypress(function(e)
{
var key = e.which;
if(key == 13)
{
//$(‘#btnSubmit’).click();
$(“#btnSubmit”)[0].click();
//alert(‘hi1’);
//return false;
}
});

});

</head>
<body>
<form id=”form1″ runat=”server”>
<fieldset>

 <asp:TextBox ID=”txtUser” runat=”server” class=”form-control” placeholder=”UserID”
MaxLength=”8″></asp:TextBox>
<asp:TextBox ID=”txtPassword” runat=”server” class=”form-control” placeholder=”Password”
TextMode=”Password”></asp:TextBox>
<asp:LinkButton ID=”btnSubmit” runat=”server” class=”btn btn-bricky pull-right”>Login <i class=”fa fa-arrow-circle-right”></i> </asp:LinkButton>

</fieldset>
</form>
</body>

</html>

<html>
<head>
    <title>Call Server side Button event using JQuery</title>
     src="scripts/jquery-1.4.1.min.js" type="text/javascript">
     type="text/javascript">
        $(document).ready(function () {
            $("#lnkbtn").click(function () {
                $("#<%=Button1.ClientID %>")[0].click(); }); }); 
</head> 
<body>  
   <form id="form1" runat="server"> 
     <a id = "lnkbtn" href = "#">Click</a> 
     <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /> 
   </form> 
</body> 
</html>