ASP.NET Web Forms
- XML file
In
A
SP.NET you can bind an XML file to a List control by using it as a data source.
Please refer to this section.
We can bind XML files to list controls.
An XML file
Here's an XML file .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>
Check out this XML file:
.xml
Bind DataSet to the List control
First, import the System.Data namespace. W
e need the namespace to work with the DataSet object.
Include the following instruction at the top .aspx the page:
<%@ Import Namespace="System.Data" %>
Next, create a DataSet for the XML file and load the XML file into the DataSet the first time the page loads:
<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New DataSet
mycountries.ReadXml(MapPath("countries.xml"))
end if
end sub
In order to bind data to the RadioButtonList control, first create a RadioButtonList control (without any asp:ListItem elements) in the .aspx page:
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server" AutoPostBack="True" />
</form>
</body>
</html>
Then add the script that created XML DataSet and bind the values in XML DataSet to the RadioButtonList control:
<%@ 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 that is executed when the user clicks on an item in the RadioButtonList control.
When a single button is clicked, a line of text appears in the label:
<%@ 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>
That's ASP.NET about XML data binding.
Related tutorials
XML tutorial