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Asp.net Currency Exchange Rate via RSS

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20 Jun 2007 70.3K   754   19   6
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.

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="<a href="http://www.w3.org/1999/xhtml">http://www.w3.org/1999/xhtml</a>" >
//<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="<a href="http://currencysource.com/RSS/ARS.xml%22%3EArgentine">http://currencysource.com/RSS/ARS.xml">Argentine</a> Peso</option>
//    <option value="<a href="http://currencysource.com/RSS/AUD.xml%22%3EAustralian">http://currencysource.com/RSS/AUD.xml">Australian</a> Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/BHD.xml%22%3EBahrain">http://currencysource.com/RSS/BHD.xml">Bahrain</a> Dinar</option>
//    <option value="<a href="http://currencysource.com/RSS/BWP.xml%22%3EBotswana">http://currencysource.com/RSS/BWP.xml">Botswana</a> Pula</option>
//    <option value="<a href="http://currencysource.com/RSS/BRL.xml%22%3EBrazilian">http://currencysource.com/RSS/BRL.xml">Brazilian</a> Real</option>
//    <option value="<a href="http://currencysource.com/RSS/BND.xml%22%3EBrunei">http://currencysource.com/RSS/BND.xml">Brunei</a> Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/CAD.xml%22%3ECanadian">http://currencysource.com/RSS/CAD.xml">Canadian</a> Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/CLP.xml%22%3EChilian">http://currencysource.com/RSS/CLP.xml">Chilian</a> Peso</option>
//    <option value="<a href="http://currencysource.com/RSS/CNY.xml%22%3EChinese">http://currencysource.com/RSS/CNY.xml">Chinese</a> Yuan</option>
//    <option value="<a href="http://currencysource.com/RSS/COP.xml%22%3EColombian">http://currencysource.com/RSS/COP.xml">Colombian</a> Peso</option>
//    <option value="<a href="http://currencysource.com/RSS/CYP.xml%22%3ECyprus">http://currencysource.com/RSS/CYP.xml">Cyprus</a> Pound</option>
//    <option value="<a href="http://currencysource.com/RSS/CZK.xml%22%3ECzech">http://currencysource.com/RSS/CZK.xml">Czech</a> Koruna</option>
//    <option value="<a href="http://currencysource.com/RSS/DKK.xml%22%3EDanish">http://currencysource.com/RSS/DKK.xml">Danish</a> Krone</option>
//    <option value="<a href="http://currencysource.com/RSS/EUR.xml%22%3EEuro%3C/option">http://currencysource.com/RSS/EUR.xml">Euro</option</a>>
//    <option value="<a href="http://currencysource.com/RSS/HUF.xml%22%3EHungarian">http://currencysource.com/RSS/HUF.xml">Hungarian</a> Forint</option>
//    <option value="<a href="http://currencysource.com/RSS/ISK.xml%22%3EIcelandic">http://currencysource.com/RSS/ISK.xml">Icelandic</a> Krona</option>
//    <option value="<a href="http://currencysource.com/RSS/INR.xml%22%3EIndian">http://currencysource.com/RSS/INR.xml">Indian</a> Rupee</option>
//    <option value="<a href="http://currencysource.com/RSS/IDR.xml%22%3EIndonesian">http://currencysource.com/RSS/IDR.xml">Indonesian</a> Rupiah</option>
//    <option value="<a href="http://currencysource.com/RSS/IRR.xml%22%3EIranian">http://currencysource.com/RSS/IRR.xml">Iranian</a> Rial</option>
//    <option value="<a href="http://currencysource.com/RSS/ILS.xml%22%3EIsraeli">http://currencysource.com/RSS/ILS.xml">Israeli</a> New Sheqel</option>
//    <option value="<a href="http://currencysource.com/RSS/JPY.xml%22%3EJapanese">http://currencysource.com/RSS/JPY.xml">Japanese</a> Yen</option>
//    <option value="<a href="http://currencysource.com/RSS/KRW.xml%22%3EKorean">http://currencysource.com/RSS/KRW.xml">Korean</a> Won</option>
//    <option value="<a href="http://currencysource.com/RSS/KWD.xml%22%3EKuwaiti">http://currencysource.com/RSS/KWD.xml">Kuwaiti</a> Dinar</option>
//    <option value="<a href="http://currencysource.com/RSS/LYD.xml%22%3ELibyan">http://currencysource.com/RSS/LYD.xml">Libyan</a> Dinar</option>
//    <option value="<a href="http://currencysource.com/RSS/MYR.xml%22%3EMalaysian">http://currencysource.com/RSS/MYR.xml">Malaysian</a> Ringgit</option>
//    <option value="<a href="http://currencysource.com/RSS/MTL.xml%22%3EMaltese">http://currencysource.com/RSS/MTL.xml">Maltese</a> Lira</option>
//    <option value="<a href="http://currencysource.com/RSS/MUR.xml%22%3EMauritian">http://currencysource.com/RSS/MUR.xml">Mauritian</a> Rupee</option>
//    <option value="<a href="http://currencysource.com/RSS/MXN.xml%22%3EMexican">http://currencysource.com/RSS/MXN.xml">Mexican</a> Peso</option>
//    <option value="<a href="http://currencysource.com/RSS/NPR.xml%22%3ENepalese">http://currencysource.com/RSS/NPR.xml">Nepalese</a> Rupee</option>
//    <option value="<a href="http://currencysource.com/RSS/NZD.xml%22%3ENew">http://currencysource.com/RSS/NZD.xml">New</a> Zealand Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/NOK.xml%22%3ENorwegian">http://currencysource.com/RSS/NOK.xml">Norwegian</a> Krone</option>
//    <option value="<a href="http://currencysource.com/RSS/OMR.xml%22%3EOmani">http://currencysource.com/RSS/OMR.xml">Omani</a> Rial</option>
//    <option value="<a href="http://currencysource.com/RSS/PKR.xml%22%3EPakistan">http://currencysource.com/RSS/PKR.xml">Pakistan</a> Rupee</option>
//    <option value="<a href="http://currencysource.com/RSS/PLN.xml%22%3EPolish">http://currencysource.com/RSS/PLN.xml">Polish</a> Zloty</option>
//    <option value="<a href="http://currencysource.com/RSS/GBP.xml%22%3EPound">http://currencysource.com/RSS/GBP.xml">Pound</a> Sterling</option>
//    <option value="<a href="http://currencysource.com/RSS/QAR.xml%22%3EQatar">http://currencysource.com/RSS/QAR.xml">Qatar</a> Riyal</option>
//    <option value="<a href="http://currencysource.com/RSS/SAR.xml%22%3ESaudi">http://currencysource.com/RSS/SAR.xml">Saudi</a> Arabian Riyal</option>
//    <option value="<a href="http://currencysource.com/RSS/SGD.xml%22%3ESingapore">http://currencysource.com/RSS/SGD.xml">Singapore</a> Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/SIT.xml%22%3ESlovenian">http://currencysource.com/RSS/SIT.xml">Slovenian</a> Tolar</option>
//    <option value="<a href="http://currencysource.com/RSS/ZAR.xml%22%3ESouth">http://currencysource.com/RSS/ZAR.xml">South</a> African Rand</option>
//    <option value="<a href="http://currencysource.com/RSS/LKR.xml%22%3ESri">http://currencysource.com/RSS/LKR.xml">Sri</a> Lanka Rupee</option>
//    <option value="<a href="http://currencysource.com/RSS/SEK.xml%22%3ESwedish">http://currencysource.com/RSS/SEK.xml">Swedish</a> Krona</option>
//    <option value="<a href="http://currencysource.com/RSS/SEK.xml%22%3ESwiss">http://currencysource.com/RSS/SEK.xml">Swiss</a> Franc</option>
//    <option value="<a href="http://currencysource.com/RSS/THB.xml%22%3EThai">http://currencysource.com/RSS/THB.xml">Thai</a> Baht</option>
//    <option value="<a href="http://currencysource.com/RSS/TTD.xml%22%3ETrinidad">http://currencysource.com/RSS/TTD.xml">Trinidad</a> & Tobago Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/AED.xml%22%3EU.A.E">http://currencysource.com/RSS/AED.xml">U.A.E</a>. Dirham</option>
//    <option value="<a href="http://currencysource.com/RSS/USD.xml%22%3EU.S">http://currencysource.com/RSS/USD.xml">U.S</a>. Dollar</option>
//    <option value="<a href="http://currencysource.com/RSS/VEB.xml%22%3EVenezuelan">http://currencysource.com/RSS/VEB.xml">Venezuelan</a> 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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License

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Written By
Suvendu Banik
Program Manager
India India
Love to code

Comments and Discussions

 
First Prev Next
GeneralRSS Feeds now require a password Pin
stapes22-Feb-11 3:24
stapes22-Feb-11 3:24 
GeneralDoesn't work Pin
stapes22-Feb-11 3:17
stapes22-Feb-11 3:17 
This code does not work.
When I click Fetch Value, I get an error message:

The URL cannot be empty.
Parameter name: url

Line 30: objDoc.Load(vstrURL);
GeneralOld exchange rates Pin
Zahid Rasool31-Oct-08 10:03
Zahid Rasool31-Oct-08 10:03 
GeneralGood information Pin
friendz4u12-Jul-07 0:03
friendz4u12-Jul-07 0:03 
Jokeugh Pin
Matthew Hazlett25-Jun-07 18:37
Matthew Hazlett25-Jun-07 18:37 
Generalcomment Pin
RepliCrux20-Jun-07 20:49
RepliCrux20-Jun-07 20:49 
Last Visit: 31-Dec-99 18:00     Last Update: 26-Apr-24 18:02Refresh1

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Posted 20 Jun 2007

Article Copyright 2007 by Suvendu Banik
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