Asp.net Currency Exchange Rate via RSS

Suvendu Banik

3.32/5 (7 votes)

Jun 21, 2007

71299

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This articles is to explain the use on live XML for displaying data. I have used Exchange Rates from currencysource.com to show one of many use of this technique. I have used bit of comments to explain how this code is working.

Download ExchangeRates.zip - 19.2 KB

Introduction

This code uses an RSS feed offering the latest currency exchange rates and pulls data from it when the user clicks a Fetch button. The user is able to choose a currency for which to fetch exhange rates on. This code is useful since it fetches up-to-date details on currency exchange rates - something which is ever more expected of systems that deal with commercial applications.

Background

This code uses ASP .Net 2.0, C# 2.0 and also demonstrates the usefulness of Prototype.js (a third party Javascript framework).

Using the code

The codebehind code is given as reference and followed by html code

//using System;

//using System.Data;

//using System.Configuration;

//using System.Collections;

//using System.Web;

//using System.Web.Security;

//using System.Web.UI;

//using System.Web.UI.WebControls;

//using System.Web.UI.WebControls.WebParts;

//using System.Web.UI.HtmlControls;

//using System.Xml;

//public partial class Modules_LiveExchangeRates : System.Web.UI.Page

//{

// protected void Page_Load(object sender, EventArgs e)

// {

// if (!Page.IsPostBack)

// {



// }

// }

// private void PopulateGrid(string vstrURL)

// {

// if (lstExchange.Items.Count > 0)

// {

// lstExchange.Items.Clear();

// }

// XmlDocument objDoc = new XmlDocument();

// objDoc.Load(vstrURL);

// XmlNodeList objNL;



// if (null != objDoc)

// {

// objNL = objDoc.SelectNodes("rss/channel/item");

// if (null != objNL)

// {

// foreach (XmlNode XNode in objNL)

// {

// lstExchange.Items.Add(XNode.ChildNodes[0].InnerText);

// } 

// }

// }

// }

// protected void btnFetchValue_Click(object sender, EventArgs e)

// {

// PopulateGrid(txtURL.Text.Trim());

// }

//}

 

 

 

//----------- HTML Code

 //<html xmlns="http://www.w3.org/1999/xhtml" >
//<head id="Head1" runat="server">
//    <title>Page</title>
//    <link href="../Styles/StyleSheet.css" rel="stylesheet" type="text/css" />
//    <script type="text/javascript" src="../scripts/prototype.js"></script>

//    <script type="text/javascript"> 
//    <!--
//function Rvalue() {
//  document.getElementById("rssText").innerHTML = "Copy URL into RSS Application...<br>" + document.frmPage["rss"].value;
//  $("txtURL").value=$("rss").value;
//}
//--> </script> <style type="text/css"> <!--
//.graybox {
//border: solid 1px gray;
//}

//#graybox {
//border: solid 1px gray;
//}

//.rssText {  
//    font-family: Arial, Helvetica, sans-serif; font-size: 0.8em; color: #333399;
//}

//#smlink {
//font-size: .6em;
//color: #dedede;
//font-style: normal;
//font-family: Arial, Helvetica, sans-serif;
//}

//#smlink a:link,#smlink a:visited{
//color: #7e7e7e; /*Was #dedede.*/
//text-decoration: none; }

//#smlink a:hover {
//color: #7e7e7e; 
//text-decoration: underline}
//--> </style>

//</head>
//<body>
//    <form id="frmPage" runat="server">
//    <table id="tblMain" style="width:100%" class="tablebdr1">
//    <tr>
//    <td style="height:20px" class="textorg">Live Exchage Rates</td>

//    </tr>
//    <tr>
//    <td style="height:20px"></td>

//    </tr>

//    <tr>
//    <td>
// <table border="0" cellspacing="2" cellpadding="2" id="graybox" style="width: 273px; height: 74px"> 
// <tr> <td class="textorg"><div align="center">
//    Currency Exchange Rates via <b>RSS</b></div></td></tr><tr><td>
//<select name="rss" onchange="javascript:Rvalue()">
//    <option value="0" selected="selected">Select a Currency...</option>
//    <option value="http://currencysource.com/RSS/ARS.xml">Argentine Peso</option>
//    <option value="http://currencysource.com/RSS/AUD.xml">Australian Dollar</option>
//    <option value="http://currencysource.com/RSS/BHD.xml">Bahrain Dinar</option>
//    <option value="http://currencysource.com/RSS/BWP.xml">Botswana Pula</option>
//    <option value="http://currencysource.com/RSS/BRL.xml">Brazilian Real</option>
//    <option value="http://currencysource.com/RSS/BND.xml">Brunei Dollar</option>
//    <option value="http://currencysource.com/RSS/CAD.xml">Canadian Dollar</option>
//    <option value="http://currencysource.com/RSS/CLP.xml">Chilian Peso</option>
//    <option value="http://currencysource.com/RSS/CNY.xml">Chinese Yuan</option>
//    <option value="http://currencysource.com/RSS/COP.xml">Colombian Peso</option>
//    <option value="http://currencysource.com/RSS/CYP.xml">Cyprus Pound</option>
//    <option value="http://currencysource.com/RSS/CZK.xml">Czech Koruna</option>
//    <option value="http://currencysource.com/RSS/DKK.xml">Danish Krone</option>
//    <option value="http://currencysource.com/RSS/EUR.xml">Euro</option>
//    <option value="http://currencysource.com/RSS/HUF.xml">Hungarian Forint</option>
//    <option value="http://currencysource.com/RSS/ISK.xml">Icelandic Krona</option>
//    <option value="http://currencysource.com/RSS/INR.xml">Indian Rupee</option>
//    <option value="http://currencysource.com/RSS/IDR.xml">Indonesian Rupiah</option>
//    <option value="http://currencysource.com/RSS/IRR.xml">Iranian Rial</option>
//    <option value="http://currencysource.com/RSS/ILS.xml">Israeli New Sheqel</option>
//    <option value="http://currencysource.com/RSS/JPY.xml">Japanese Yen</option>
//    <option value="http://currencysource.com/RSS/KRW.xml">Korean Won</option>
//    <option value="http://currencysource.com/RSS/KWD.xml">Kuwaiti Dinar</option>
//    <option value="http://currencysource.com/RSS/LYD.xml">Libyan Dinar</option>
//    <option value="http://currencysource.com/RSS/MYR.xml">Malaysian Ringgit</option>
//    <option value="http://currencysource.com/RSS/MTL.xml">Maltese Lira</option>
//    <option value="http://currencysource.com/RSS/MUR.xml">Mauritian Rupee</option>
//    <option value="http://currencysource.com/RSS/MXN.xml">Mexican Peso</option>
//    <option value="http://currencysource.com/RSS/NPR.xml">Nepalese Rupee</option>
//    <option value="http://currencysource.com/RSS/NZD.xml">New Zealand Dollar</option>
//    <option value="http://currencysource.com/RSS/NOK.xml">Norwegian Krone</option>
//    <option value="http://currencysource.com/RSS/OMR.xml">Omani Rial</option>
//    <option value="http://currencysource.com/RSS/PKR.xml">Pakistan Rupee</option>
//    <option value="http://currencysource.com/RSS/PLN.xml">Polish Zloty</option>
//    <option value="http://currencysource.com/RSS/GBP.xml">Pound Sterling</option>
//    <option value="http://currencysource.com/RSS/QAR.xml">Qatar Riyal</option>
//    <option value="http://currencysource.com/RSS/SAR.xml">Saudi Arabian Riyal</option>
//    <option value="http://currencysource.com/RSS/SGD.xml">Singapore Dollar</option>
//    <option value="http://currencysource.com/RSS/SIT.xml">Slovenian Tolar</option>
//    <option value="http://currencysource.com/RSS/ZAR.xml">South African Rand</option>
//    <option value="http://currencysource.com/RSS/LKR.xml">Sri Lanka Rupee</option>
//    <option value="http://currencysource.com/RSS/SEK.xml">Swedish Krona</option>
//    <option value="http://currencysource.com/RSS/SEK.xml">Swiss Franc</option>
//    <option value="http://currencysource.com/RSS/THB.xml">Thai Baht</option>
//    <option value="http://currencysource.com/RSS/TTD.xml">Trinidad & Tobago Dollar</option>
//    <option value="http://currencysource.com/RSS/AED.xml">U.A.E. Dirham</option>
//    <option value="http://currencysource.com/RSS/USD.xml">U.S. Dollar</option>
//    <option value="http://currencysource.com/RSS/VEB.xml">Venezuelan Bolivar</option>
//</select>
//</td>
//    </tr>
//     <tr style="display:none">
// <td>
//     <div align="left">
//     </div>
//     <div id="rssText" align="left" class="textorg">

//// URL:
//     </div>
//     <asp:TextBox ID="txtURL" runat="server" Text=""></asp:TextBox>
// </td>
//     </tr>

//  </table>
//  <!-- That's it! Your site visitors now have access to continuously updated Currency Exchange Rates via RSS! --> 
//<asp:Button ID="btnFetchValue" runat="server" Text="Fetch Value" OnClick="btnFetchValue_Click" /></td>
//    </tr>

//     <tr>
//    <td>
//    <asp:ListBox ID="lstExchange" runat="server" Width="363px" Height="456px"></asp:ListBox>
//    </td>


//    </tr>


//    </table>
//    </form>
//</body>
//</html>

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