c# | call function from another file c#

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call function from another file c#

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// calling the function GetIP() to obtain ip address
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{

Response.Write(GetIP());

}
</script>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</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;
using System.Web.Script.Serialization;

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

}
[WebMethod]
public static string GetIP()
{

using (var webClient = new System.Net.WebClient()){
var data = webClient.DownloadString("https://geoip-db.com/json ");
JavaScriptSerializer jss = new JavaScriptSerializer();
var d = jss.Deserialize<dynamic>(data);
string ipv4 = d["IPv4"];
return "ip address: " + ipv4;
}

}
}