mainform.cs

how to use RSS services on windows mobile

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Xml;
using System.IO;

namespace LiveQnA1
{
    /// <summary>
    /// This sample shows how to access Windows Live QnA on a Pocket PC in a few different ways.
    /// In a tab control, the Windows Live QnA site is shown in a browser control, in a browser control using an RSS feed,
    /// in a text box showing the raw RSS feed and, assigning the RSS feed to a DataSet inside a data grid. 
    /// </summary>
    /// <remarks>
    /// More information about accessing Live QnA making use of URL encoding can be found here:
    /// http://liveqna.spaces.live.com/blog/cns!2933A3E375F68349!390.entry
    /// </remarks>
    public partial class MainForm : Form
    {
        private DataSet ds;
        private DataView dv;
        private int idx;

        public MainForm()
        {
            InitializeComponent();
        }

        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (tabControl1.SelectedIndex == 0)
            {
                // Show Live QnA service in Browser
                webBrowser1.Navigate(new Uri("http://qna.live.com/Search.aspx?q=meta:Search.qstate(0)"));
            }
            else if (tabControl1.SelectedIndex == 1)
            {
                // Show Live QnA RSS feed in Browser
                webBrowser2.Navigate(new Uri("http://qna.live.com/Search.aspx?q=meta:Search.qstate(0)&format=rss"));
            }
            else if (tabControl1.SelectedIndex == 2)
            {
                // Show Live QnA raw RSS data in a text box
                Cursor.Current = Cursors.WaitCursor;
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://qna.live.com/Search.aspx?q=meta:Search.qstate(0)&format=rss");
                HttpWebResponse response = (HttpWebResponse)req.GetResponse();
                StreamReader rdr = new StreamReader(response.GetResponseStream());
                textBox1.Text = rdr.ReadToEnd();
                Cursor.Current = Cursors.Default;
            }
            else
            {
                // Show Live QnA RSS data in a datagrid. In order to easily do so, first store the RSS feed in a DataSet.
                Cursor.Current = Cursors.WaitCursor;
                ds = new DataSet();
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://qna.live.com/Search.aspx?q=meta:Search.qstate(0)&format=rss");
                HttpWebResponse response = (HttpWebResponse)req.GetResponse();
                XmlTextReader xmlRdr = new XmlTextReader(response.GetResponseStream());
                ds.ReadXml(xmlRdr);
                idx = 0;
                dv = new DataView(ds.Tables[idx]);
                dataGrid1.DataSource = dv;
                Cursor.Current = Cursors.Default;
            }
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            webBrowser1.Navigate(new Uri("http://qna.live.com/Search.aspx?q=meta:Search.qstate(0)"));
        }

        private void dataGrid1_Click(object sender, EventArgs e)
        {
            // Simply walk through the different tables of the dataset, containing the RSS feed.
            idx = (idx + 1) % ds.Tables.Count;
            dv = new DataView(ds.Tables[idx]);
            dataGrid1.DataSource = dv;
        }
    }
}