Mega Code Archive
Read input from text field, do calculation then output to the save page (C#)
<![CDATA[
File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="CurrencyConverter" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Currency Converter</title>
</head>
<body>
<form ID="Form1" method="post" runat="server">
<div>
Convert:
<input type="text" ID="US" runat="server"/>U.S. dollars to
<select ID="Currency" runat="server" />
<br /><br />
<input type="submit" value="OK" ID="Convert" runat="server" OnServerClick="Convert_ServerClick" />
<input type="submit" value="Show Graph" ID="ShowGraph" runat="server" OnServerClick="ShowGraph_ServerClick" />
<br /><br />
<img ID="Graph" alt="Currency Graph" scr="" runat="server" />
<br /><br />
<div style="font-weight: bold" ID="Result" runat="server"></div>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
public partial class CurrencyConverter : System.Web.UI.Page
{
protected void Page_Load(Object sender, EventArgs e)
{
if (this.IsPostBack == false)
{
Currency.Items.Add(new ListItem("Euros", "0.5"));
Currency.Items.Add(new ListItem("Japanese Yen", "100"));
Currency.Items.Add(new ListItem("Canadian Dollars", "2"));
}
Graph.Visible = false;
}
protected void Convert_ServerClick(object sender, EventArgs e)
{
decimal amount;
bool success = Decimal.TryParse(US.Value, out amount);
if (success)
{
ListItem item = Currency.Items[Currency.SelectedIndex];
decimal newAmount = amount * Decimal.Parse(item.Value);
Result.InnerText = amount.ToString() + " U.S. dollars = ";
Result.InnerText += newAmount.ToString() + " " + item.Text;
}
else
{
Result.InnerText = "The number you typed in was not in the correct format. ";
Result.InnerText += "Use only numbers.";
}
}
protected void ShowGraph_ServerClick(object sender, EventArgs e)
{
Graph.Src = "Pic" + Currency.SelectedIndex.ToString() + ".png";
Graph.Visible = true;
}
}
]]>