how to read data from xml

where's the subcategory?

well, this


<category id="1368" adult="N" name="Arte e Artesanato">
      <category id="5460" adult="N" name="Artesanato"></category>
      <category id="2662" adult="N" name="Esculturas"></category>
      <category id="40285" adult="N" name="Ferramentas e Materiais"></category>
      <category id="1370" adult="N" name="Gravuras"></category>
     <category id="5464" adult="N" name="Livros"></category>
     <category id="1369" adult="N" name="Pinturas"></category>
     <category id="1371" adult="N" name="Outros"></category>
</category>

i formated above so you can see there is category id="1368" and the others inside are subcategorys.

since xml contains hierarchy using tree-view control is better approach.
how would u like to display this kind of structure in listview?

Hi rafaelrgl;

The following code uses Linq to XML to query the document and build your ListView control.

using System.Xml.Linq;

// Load the XML file from the file system. Change path to the file below
XDocument doc = XDocument.Load("C:/Working Directory/Response.xml");

// Get a reference to the categories node
XElement categoriesElements = doc.Root.Element("categories");

// Query the document for the needed info.
var results = (from d in categoriesElements.Elements("category")
               select new
                          {
                              Parent = d.Attribute("name").Value,
                              Children = (from c in d.Elements("category")
                                          select c.Attribute("name").Value).ToList()
                          }).ToList();

// Build your list view items
foreach (var node in results)
{
    // New parent node
    var lItem = new ListViewItem(node.Parent);
    foreach (var child in node.Children)
    {
        // Add all children nodes
        lItem.SubItems.Add(child);
    }
    // Attach parent node to the list view control
    listView1.Items.Add(lItem);
}

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i mean tree-view, sorry  sedgwick. how this can be accomplish

@FernandoSoto
what did u set to the View property of the listview?
there's no correlation between the parent categories and the child categories when u display them in listview in this matter.

here in treeview:

        private void populateTreeview()
        {
            WebRequest req = WebRequest.Create("http://www.mercadolivre.com.br/jm/categsXml?as_site_id=MLB&as_max_level=2");
            WebResponse resp = req.GetResponse();
            StreamReader textReader = new StreamReader(resp.GetResponseStream());
            XmlTextReader xmlReader = new XmlTextReader(textReader);

            xmlReader.XmlResolver = null;
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.XmlResolver = null;
            xmlDoc.Load(xmlReader);
            treeView1.Nodes.Clear();
            treeView1.Nodes.Add(new TreeNode(xmlDoc.DocumentElement.Name));
            TreeNode tNode = new TreeNode();
            tNode = (TreeNode)treeView1.Nodes[0];
            addTreeNode(xmlDoc.DocumentElement, tNode);
            treeView1.ExpandAll();

        }
        //This function is called recursively until all nodes are loaded
        private void addTreeNode(XmlNode xmlNode, TreeNode treeNode)
        {
            XmlNode xNode;
            TreeNode tNode;
            XmlNodeList xNodeList;
            if (xmlNode.HasChildNodes) //The current node has children
            {
                xNodeList = xmlNode.ChildNodes;
                for (int x = 0; x <= xNodeList.Count - 1; x++)
                //Loop through the child nodes
                {
                    xNode = xmlNode.ChildNodes[x];
                    treeNode.Nodes.Add(new TreeNode(xNode.Name));
                    tNode = treeNode.Nodes[x];
                    addTreeNode(xNode, tNode);
                }
            }
            else //No children, so add the outer xml (trimming off whitespace)
                treeNode.Text = xmlNode.OuterXml.Trim();
        }

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sedgwick, did this code worked for you, did you tested, because for me did not worked. i does not show the content right.

Imports System.Net
Imports System.Xml
Imports System.IO

Partial Class WebUserControl_CategoriasVertical
    Inherits System.Web.UI.UserControl

    Protected Sub Page_Init(sender As Object, e As System.EventArgs) Handles Me.Init
        populateTreeview()

    End Sub
    Private Sub populateTreeview()
        Dim req As WebRequest = WebRequest.Create("http://www.mercadolivre.com.br/jm/categsXml?as_site_id=MLB&as_max_level=2")
        Dim resp As WebResponse = req.GetResponse()
        Dim textReader As New StreamReader(resp.GetResponseStream())
        Dim xmlReader As New XmlTextReader(textReader)

        xmlReader.XmlResolver = Nothing
        Dim xmlDoc As New XmlDocument()
        xmlDoc.XmlResolver = Nothing
        xmlDoc.Load(xmlReader)
        TreeView1.Nodes.Clear()
        TreeView1.Nodes.Add(New TreeNode(xmlDoc.DocumentElement.Name))
        Dim tNode As New TreeNode()
        tNode = DirectCast(TreeView1.Nodes(0), TreeNode)
        addTreeNode(xmlDoc.DocumentElement, tNode)
        TreeView1.ExpandAll()

    End Sub
    'This function is called recursively until all nodes are loaded
    Private Sub addTreeNode(xmlNode As XmlNode, treeNode As TreeNode)
        Dim xNode As XmlNode
        Dim tNode As TreeNode
        Dim xNodeList As XmlNodeList
        If xmlNode.HasChildNodes Then
            'The current node has children
            xNodeList = xmlNode.ChildNodes
            For x As Integer = 0 To xNodeList.Count - 1
                'Loop through the child nodes
                xNode = xmlNode.ChildNodes(x)
                treeNode.ChildNodes.Add(New TreeNode(xNode.Name))
                tNode = treeNode.ChildNodes(x)
                addTreeNode(xNode, tNode)
            Next
        Else
            'No children, so add the outer xml (trimming off whitespace)
            treeNode.Text = xmlNode.OuterXml.Trim()
        End If
    End Sub

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i see, you are using the win32 version, i want for asp.net webforms, and i don't want to show the xml file, but the category like this:


Arte e Artesanato
         Artesanato
         Esculturas
         Ferramentas e Materiais
         Gravuras


and i want to be able to have this as an link, so i can build some propertys like put the id on the link, so on.

hi fernando, i am not use to Linq.

So how do i make this sample to work on asp.net using vb.net