c# | get width and height screen c#

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how to get the width and height of a screen using C# ?

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// default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>TITLE</title>

<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 () {
var widthscreen = screen.width;
var heightscreen = screen.height;
$.ajax({
type: "POST",
contentType: "application/json;charset=utf-8",
url: "Default.aspx/DisplayData",
data: '{param1: "' + widthscreen + '", param2: "' + heightscreen + '"}',
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>

// 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;

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

}
[WebMethod]
public static string DisplayData(int param1, int param2)
{

return "screen.width " + param1 + " screen.height " + param2;

}
}