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Editorial Team
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Asked: 2026-05-30T08:22:16+00:00

I am learning C# & ASP.NET to make a website. I am attempting to

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I am learning C# & ASP.NET to make a website. I am attempting to access a .aspx script through AJAX & just get some HTML back.

So I access the script http://www.mywebsite.com/test.aspx?i=199 & all it returns is:

<p>You queried: 199</p>

Does ASP.NET allow me to pass CGI variables(i=199) or am I meant to use a different method?

Is this the correct way you are meant to use scripts in a ASP.NET websites:

test.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="test.aspx.cs" Inherits="WebApplication1.test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<div id="testDiv" runat="server"></div>

<!-- Must I have the html, head & body elements or can I just return a div? -->

test.aspx.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
{
    public partial class test : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            int index = url.Split("i=").Last(); // this causes an error: split has some invalid arguments
            testDiv.InnerHtml = string.Format("<p>You Queried: {0}", index);
        }
    }
}

The way I use the script is to have a button on my home page that when click makes an AJAX request to test.aspx & gets back the p HTML element/text:

function getData( n )
{
     $.ajax({
      type: "POST",
      url: "test.aspx",
      data: "i="+n
      }).done(function( msg ) {
           $("textarea:first").html(msg) );
       });
}

<button onclick="getData(199)"/>
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1 Answer

  1. Editorial Team

    This isn’t specific to asp.net.

    You need to look at the request object, specifically the Query String collection. These concepts are common to many web server side languages/frameworks. Through personal experience Ive used it in classic asp, asp.net and php.

    To get the value from the query string:

    string val = Request.QueryString["i"];
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