Windows Phone simple Twitter Client ap

Create a project with the name TwitterClient and have a main.xaml with following layout


<phone:PhoneApplicationPage 
    x:Class="TwitterClient.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <Grid.RowDefinitions>
            <RowDefinition Height="74*" />
            <RowDefinition Height="533*" />
        </Grid.RowDefinitions>
        <TextBox Grid.RowSpan="2" Height="72" HorizontalAlignment="Left" Margin="9,8,0,0" Name="txtUserName" VerticalAlignment="Top" Width="294" />
        <Button Content="Lookup" Grid.RowSpan="2" Height="72" HorizontalAlignment="Left" Margin="296,8,0,0" Name="btnLookupUser" VerticalAlignment="Top" Width="160" Click="btnLookupUser_Click" />
        <ListBox Name="lstTwitter" Grid.Row="1" Margin="10, 10, 10, 10">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Height="110" Margin="-10,-10,-10,-10">
                        <Image Source="{Binding ImageSource}" Height="73" Width="73" VerticalAlignment="Top" Margin="10,10,8,10"/>
                        <TextBlock Text="{Binding Message}" Margin="10" TextWrapping="Wrap" FontSize="18" Width="350" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

copy the given below code to mainpage.xaml.cs




using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.Xml.Linq;

namespace TwitterClient
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }
        private void btnLookupUser_Click(object sender, RoutedEventArgs e)
        {
            WebClient twitter = new WebClient();
            twitter.DownloadStringCompleted += new DownloadStringCompletedEventHandler(twitter_DownloadStringCompleted);
            twitter.DownloadStringAsync(new Uri("http://api.twitter.com/1/statuses/user_timeline.xml?screen_name=" + txtUserName.Text));
        }


        void twitter_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error != null)
                return;

            XElement xmlTweets = XElement.Parse(e.Result);

            lstTwitter.ItemsSource = from tweet in xmlTweets.Descendants("status")
                                     select new TwitterItem
                                     {
                                         ImageSource = tweet.Element("user").Element("profile_image_url").Value,
                                         Message = tweet.Element("text").Value
                                     };
        }
    }

    public class TwitterItem
    {
        public string ImageSource { get; set; }
        public string Message { get; set; }
    }
}

have a screen shot as follows for the output

download source code from Simple twitter client