Mega Code Archive
Create and display in-memory calculated fields
<![CDATA[
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="Default" %>
<!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 runat="server">
<title>Cities and Customers</title>
</head>
<body>
<div id="pageContent">
<form id="form1" runat="server">
<h2>Find Customers' Cities</h2>
<hr />
<asp:DropDownList runat="server" ID="CityList" Width="230px">
</asp:DropDownList>
<asp:Button ID="CityButton" runat="server" Text="Get cities..." OnClick="CityButton_Click" />
<hr />
</form>
</div>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default : System.Web.UI.Page
{
protected void CityButton_Click(object sender, EventArgs e)
{
string connString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
string cmdText = "SELECT DISTINCT country, city FROM customers";
DataTable data = new DataTable();
SqlDataAdapter adapter = new SqlDataAdapter(cmdText, connString);
adapter.Fill(data);
data.Columns.Add("CityCountry", typeof(string), "city + ' ('+ country + ')'");
CityList.DataTextField = "CityCountry";
CityList.DataSource = data;
CityList.DataBind();
}
}
]]>