Skip to main content

ASP .NET - XML Files

An XML File

Here is an XML file named "countries.xml":
<?xml version="1.0" encoding="ISO-8859-1"?>

<countries>

<country>
  <text>Norway</text>
  <value>N</value>
</country>

<country>
  <text>Sweden</text>
  <value>S</value>
</country>

<country>
  <text>France</text>
  <value>F</value>
</country>

<country>
  <text>Italy</text>
  <value>I</value>
</country>

</countries>

Bind a DataSet to a List Control

First, import the "System.Data" namespace. We need this namespace to work with DataSet objects. Include the following directive at the top of an .aspx page:
<%@ Import Namespace="System.Data" %>
Next, create a DataSet for the XML file and load the XML file into the DataSet when the page is first loaded:
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
  dim mycountries=New DataSet
  mycountries.ReadXml(MapPath("countries.xml"))
end if
end sub
To bind the DataSet to a RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in an .aspx page:
<html>
<body>

<form runat="server">
<asp:RadioButtonList id="rb" runat="server" AutoPostBack="True" />
</form>

</body>
</html>
Then add the script that builds the XML DataSet:
<%@ Import Namespace="System.Data" %>

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
  dim mycountries=New DataSet
  mycountries.ReadXml(MapPath("countries.xml"))
  rb.DataSource=mycountries
  rb.DataValueField="value"
  rb.DataTextField="text"
  rb.DataBind()
end if
end sub
</script>

<html>
<body>

<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
</form>

</body>
</html>
Then we add a sub routine to be executed when the user clicks on an item in the RadioButtonList control. When a radio button is clicked, a text will appear in a label:

Example

<%@ Import Namespace="System.Data" %>

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
  dim mycountries=New DataSet
  mycountries.ReadXml(MapPath("countries.xml"))
  rb.DataSource=mycountries
  rb.DataValueField="value"
  rb.DataTextField="text"
  rb.DataBind()
end if
end sub

sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & rb.SelectedItem.Text
end sub
</script>

<html>
<body>

<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
<p><asp:label id="lbl1" runat="server" /></p>
</form>

</body>
</html>
Labels:

Comments

Post a Comment

Popular posts from this blog

create a table in SQL

To create a table, you can follow this formula: CREATE TABLE Country( Column1 , Column2 , Column3 ) or: CREATE TABLE Country( Column1 , Column2 , Column3 ); Each column is created as: ColumnName DataType Options Here is an example: CREATE TABLE Customers ( DrvLicNbr nvarchar(32), DateIssued DATE, DateExpired date, FullName nvarchar(50), Address NVARCHAR(120), City NvarChar(40), State NVarChar(50), PostalCode nvarchar(20), HomePhone nvarchar(20), OrganDonor BIT); GO To start from a sample code, open an empty Query window and display the Template Explorer. From the Template Explorer, expand Table. Drag Create Table and drop it in the Query window: -- ========================================= -- Create table template -- ========================================= USE <database, sysname, AdventureWorks> GO IF OBJECT_ID('<schema_name, sysname, dbo>.<table_name, sysname, sample_table>', 'U') IS NOT NULL DROP TABLE <schema_name, sysname, d...
Post a Comment
Read more

Stored Procedures

Practical Learning: Introducing Stored Procedures Start Microsoft  SQL  Server  Management  Studio  and log in to your  server On the main menu, click File -> New -> Query With Current Connection To create a new database, copy and paste the following code in the Query window:   -- ============================================= -- Database: WattsALoan -- ============================================= USE master GO -- Drop the database if it already exists IF EXISTS ( SELECT name FROM sys.databases WHERE name = N'WattsALoan' ) DROP DATABASE WattsALoan GO CREATE DATABASE WattsALoan GO -- ========================================= -- Table: Employees -- ========================================= USE WattsALoan GO IF OBJECT_ID(N'dbo.Employees', N'U') IS NOT NULL DROP TABLE dbo.Employees GO CREATE TABLE dbo.Employees ( EmployeeID int identity(1,1) NOT NULL, EmployeeNumber nchar(10) NULL, FirstName nvarchar(20) NULL, LastName nvarcha...
Post a Comment
Read more

WPF Tutorial - Binding without XAML

The introduction of binding and XAML has made creating user interfaces in .NET a much more enjoyable experience compared to previous incarnations. Binding is such an integral part of the WPF experience that most developers thoroughly understand how to do it in XAML, however what we're going to look at today is how to create a binding using only C# code. I'm going to build a very basic example application - it has a TextBlock and a TextBox. Whatever is typed into the TextBox, will be reflected in the TextBlock. Here's a screenshot of what I'm talking about: This application lends itself perfectly to XAML binding, and in fact that's the first way I implemented it. <Window x:Class = "BindingWithoutXAML.MainWindow"         xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml"         Title = "MainWindow"     ...
Post a Comment
Read more