First add an XML file, to the web application project. To do this
1. Right click on the web application project, and select Add => New Item.
2. In the Add New Item dialog box, select XML File.
3. Give the XML file a meaningful name. In our case let's name it Countries.xml and click Add.
4. In the Countries.xml file, copy and paste the following
<?xml version="1.0" encoding="utf-8" ?>
<Countries>
<Country>
<CountryId>101</CountryId>
<CountryName>India</CountryName>
</Country>
<Country>
<CountryId>102</CountryId>
<CountryName>US</CountryName>
</Country>
<Country>
<CountryId>103</CountryId>
<CountryName>Australia</CountryName>
</Country>
<Country>
<CountryId>104</CountryId>
<CountryName>UK</CountryName>
</Country>
</Countries>
Drag and drop a DropDownList on the webform. Copy and paste the following code in the code behind page.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Create a new DataSet
DataSet DS = new DataSet();
//Read the xml data from the XML file using ReadXml() method
DS.ReadXml(Server.MapPath("Countries.xml"));
DropDownList1.DataTextField = "CountryName";
DropDownList1.DataValueField = "CountryId";
DropDownList1.DataSource = DS;
DropDownList1.DataBind();
ListItem li = new ListItem("Select", "-1");
DropDownList1.Items.Insert(0, li);
}
}
The important thing to notice here is that, we are using ReadXml() method of the DataSet object, to read the data from the Countries.xml file into a DataSet.Server.MapPath() method returns the physical path of the file from the provided virtual path. We will discuss about this method in a later video session.
To insert a ListItem at a specific location use the Insert() method specifying the index of the location where you want to insert, and the listitem object.
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