Here is a sample implementation, which displaying RSS feeds in a WPF application.

private void cmdRead_Click(object sender, RoutedEventArgs e)
{
    WebClient client = new WebClient();
    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
    client.DownloadStringAsync(new Uri(this.txtUrl.Text));
}

private void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    XmlReader reader = XmlReader.Create(new StringReader(e.Result));
    SyndicationFeed feed = SyndicationFeed.Load(reader);
    this.lstBox.ItemsSource = feed.Items;
}

private void linkUrl_Click(object sender, RoutedEventArgs e)
{
    string url = (e.Source as Hyperlink).NavigateUri.AbsoluteUri;
    Process.Start(url);
}

And here is the WPF – XAML

<Window x:Class="RssReader.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <TextBlock Grid.Column="0">URL</TextBlock>
            <TextBox Name="txtUrl" Grid.Column="1" />
            <Button Content="Read" Name="cmdRead" Click="cmdRead_Click" Grid.Column="2" />
        </Grid>
        <ListBox Name="lstBox" Grid.Row="1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="{Binding Path=Title.Text}" />
                        <TextBlock TextAlignment="Justify" Text="{Binding Path=Summary.Text}" />

                        <TextBlock>
                            <Hyperlink Name="linkUrl" Click="linkUrl_Click" NavigateUri="{Binding Path=Id}">
                                <Label Content="{Binding Path=Title.Text}" ></Label>
                            </Hyperlink>
                        </TextBlock>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <StatusBar Grid.Row="2">
            <StatusBarItem Content="Welcome to RSS Reader" />
        </StatusBar>
    </Grid>
</Window>

This is a basic implementation, you can add more features like multiple urls, settings etc. You can developing a RSS client in silverlight with the same code, but the problem with silverlight is we require a crossdomainpolicy.xml file in the server. If the file is not found it will throw security exception.

Happy Programming.

<Window x:Class="dotnetthoughts.net.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=System"
Title="WPF SpellCheck Demo" Height="350" Width="525" Loaded="Window_Loaded">
<DockPanel>
<TextBox Name="txtEdit" SpellCheck.IsEnabled="True"
                AcceptsReturn="True"
ContextMenuOpening="txtEdit_ContextMenuOpening"
                VerticalScrollBarVisibility="Visible">
<TextBox.ContextMenu>
<ContextMenu Name="ctxMenu" />
</TextBox.ContextMenu>
</TextBox>
</DockPanel>
</Window>

And here is the code behind

namespace dotnetthoughts.net
{
    using System;
    using System.IO;
using System.Linq;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Documents;
    using System.Windows.Input;

public partial class MainWindow : Window
    {
public MainWindow()
        {
InitializeComponent();
        }

private void txtEdit_ContextMenuOpening(object sender, ContextMenuEventArgs e)
        {
            int index = 0;
this.txtEdit.ContextMenu.Items.Clear(); //Clearing the existing items
            //Getting the spellcheck suggestions.
SpellingError spellingError = this.txtEdit.GetSpellingError(this.txtEdit.CaretIndex);
if (spellingError != null && spellingError.Suggestions.Count() >= 1)
            {
                //Creating the suggestions menu items.
foreach (string suggestion in spellingError.Suggestions)
                {
MenuItem menuItem = new MenuItem();
                    menuItem.Header = suggestion;
menuItem.FontWeight = FontWeights.Bold;
menuItem.Command = EditingCommands.CorrectSpellingError;
                    menuItem.CommandParameter = suggestion;
menuItem.CommandTarget = this.txtEdit;
this.txtEdit.ContextMenu.Items.Insert(index, menuItem);
                    index++;
                }
Separator seperator = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator);
                index++;
//Adding the IgnoreAll menu item
MenuItem IgnoreAllMenuItem = new MenuItem();
                IgnoreAllMenuItem.Header = "Ignore All";
IgnoreAllMenuItem.Command = EditingCommands.IgnoreSpellingError;
IgnoreAllMenuItem.CommandTarget = this.txtEdit;
                this.txtEdit.ContextMenu.Items.Insert(index, IgnoreAllMenuItem);
                index++;
            }
            else
            {
//No Suggestions found, add a disabled NoSuggestions menuitem.
                MenuItem menuItem = new MenuItem();
menuItem.Header = "No Suggestions";
                menuItem.IsEnabled = false;
this.txtEdit.ContextMenu.Items.Insert(index, menuItem);
                index++;
            }
//.Net 4.0 Supports CustomDictionaries, Option for Adding to dictionary.
int selectionStart = this.txtEdit.GetSpellingErrorStart(this.txtEdit.CaretIndex);
            if (selectionStart >= 0)
            {
                Separator seperator1 = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator1);
                index++;
MenuItem AddToDictionary = new MenuItem();
                AddToDictionary.Header = "Add to Dictionary";
                //Getting the word to add
this.txtEdit.SelectionStart = selectionStart;
this.txtEdit.SelectionLength = this.txtEdit.GetSpellingErrorLength(this.txtEdit.CaretIndex);
                //Ignoring the added word.
AddToDictionary.Command = EditingCommands.IgnoreSpellingError;
AddToDictionary.CommandTarget = this.txtEdit;
AddToDictionary.Click += (object o, RoutedEventArgs rea) =>
                {
this.AddToDictionary(this.txtEdit.SelectedText);
                };
this.txtEdit.ContextMenu.Items.Insert(index, AddToDictionary);
                index++;
            }

//Common Edit MenuItems.
            Separator seperator2 = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator2);
            index++;
            //Cut
MenuItem cutMenuItem = new MenuItem();
cutMenuItem.Command = ApplicationCommands.Cut;
this.txtEdit.ContextMenu.Items.Insert(index, cutMenuItem);
            index++;
            //Copy
MenuItem copyMenuItem = new MenuItem();
copyMenuItem.Command = ApplicationCommands.Copy;
this.txtEdit.ContextMenu.Items.Insert(index, copyMenuItem);
            index++;
            //Paste
MenuItem pasteMenuItem = new MenuItem();
pasteMenuItem.Command = ApplicationCommands.Paste;
this.txtEdit.ContextMenu.Items.Insert(index, pasteMenuItem);
            index++;
            Separator seperator3 = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator3);
            index++;
            //Delete
MenuItem deleteMenuItem = new MenuItem();
deleteMenuItem.Command = ApplicationCommands.Delete;
            this.txtEdit.ContextMenu.Items.Insert(index, deleteMenuItem);
            index++;
            Separator seperator4 = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator4);
            index++;
            //Select All
MenuItem selectAllMenuItem = new MenuItem();
selectAllMenuItem.Command = ApplicationCommands.SelectAll;
            this.txtEdit.ContextMenu.Items.Insert(index, selectAllMenuItem);
            index++;
        }
        //Method to Add text to Dictionary
private void AddToDictionary(string entry)
        {
using (StreamWriter streamWriter = new StreamWriter(@"D:\WPF\MyCustomDictionary.lex", true))
            {
streamWriter.WriteLine(entry);
            }
        }

private void Window_Loaded(object sender, RoutedEventArgs e)
        {
//Assigning custom Dictionary to TextBox
this.txtEdit.SpellCheck.CustomDictionaries.Add(new Uri(@"D:\WPF\MyCustomDictionary.lex"));
        }
    }
}

The .Net Framework 4.0 supports CustomDictionaries, which helps to create your own Dictionary.

//.Net 4.0 Supports CustomDictionaries, Option for Adding to dictionary.
int selectionStart = this.txtEdit.GetSpellingErrorStart(this.txtEdit.CaretIndex);
if (selectionStart >= 0)
{
    Separator seperator1 = new Separator();
this.txtEdit.ContextMenu.Items.Insert(index, seperator1);
    index++;
MenuItem AddToDictionary = new MenuItem();
    AddToDictionary.Header = "Add to Dictionary";
    //Getting the word to add
this.txtEdit.SelectionStart = selectionStart;
this.txtEdit.SelectionLength = this.txtEdit.GetSpellingErrorLength(this.txtEdit.CaretIndex);
    //Ignoring the added word.
AddToDictionary.Command = EditingCommands.IgnoreSpellingError;
AddToDictionary.CommandTarget = this.txtEdit;
AddToDictionary.Click += (object o, RoutedEventArgs rea) =>
    {
this.AddToDictionary(this.txtEdit.SelectedText);
    };
this.txtEdit.ContextMenu.Items.Insert(index, AddToDictionary);
    index++;
}

Here is the screenshot of Demo Application.

WPF Spell Check Demo - Screenshot

1. Create a Windows Application Project.
2. Right Click on the Project Node in the solution explorer, select Add New Item, and Select User Control(WPF) from Add New Item Dialog.
3. In the User Contol I wrote some code to change the Color on MouseMove and I wrote the click event in the Codebehind.

XAML Code

<Grid>
    <Grid.Resources>
        <Style TargetType="Button" x:Key="CustomButton">
            <Setter Property="FontSize" Value="15" />
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="FontSize" Value="20" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Grid.Resources>
    <Button Style="{StaticResource CustomButton}"
            Content="Hello World"
            Click="Button_Click">
    </Button>
</Grid>

Code behind – C#

private void Button_Click(object sender, RoutedEventArgs e)
{
	MessageBox.Show("WPF UserControl Event");
}

4. Build the Project.
5. Drag and Drop, ElementHost control from WPF interoperability tab.
6. You can Set the host the WPF usercontrol either by selecting Select Host Content from Smart Menu, or by Setting the Child Property in the Property List. (The control will be populated in the List only if you build the application, after you added the control.)
7. You can also do it in runtime by setting Child Property of the Element Host control.

private void Form1_Load(object sender, EventArgs e)
{
        SampleWPFCtrl ctrl1 = new SampleWPFCtrl();
            this.elementHost1.Child = ctrl1;
}



WPF Usercontol Control in Windows Form

Happy Coding

Related content:

1. Menu Icons in WPF
2. System.InvalidOperationException – Cross-thread operation not valid
3. Implementing Close button in Tab Pages
4. Gridsplitter control in WPF
5. Developing a simple RSS Reader in C#.Net
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