In the previous step, you created a new application and added the RichTextBox and RichTextBoxToolbar controls to the application. If you currently click the Spell Check button in the toolbar at runtime, you receive a message that spell checking is currently not set up. In this step, you customize the application further and add spell-checking functionality to the application.

To add spell checking to the application, complete the following steps:

1. In the Solution Explorer, right-click the project and select Add | Existing Item.
2. In the Add Existing Item dialog, locate the C1Spell_en-US.dct file that can be found in the installed folder at the following location: C:\...\Documents\ComponentOne Samples\WPF\C1.WPF.RichTextBox\CS\RichTextBoxSamples\Resources
    This is a US English dictionary file ? if you add another file, instead, you can adapt the steps below with the appropriate code.
3. In the Solution Explorer, right-click the MainPage.xaml file and select View Code to open the code file.
4. In the code editor, add the required import statements.
   • Visual Basic
   • C#

   • Visual Basic

   Imports C1.WPF.RichTextBox
   Imports C1.WPF.SpellChecker
   

   • C#

   using C1.WPF.RichTextBox;
   using C1.WPF.SpellChecker;
   

5. Add code to the MainPage constructor to add spell-check functionality in the RichTextBox control.
   • Visual Basic
   • C#

   • Visual Basic

   InitializeComponent()
   Dim spell = New C1SpellChecker()
   spell.MainDictionary.LoadAsync("C1Spell_en-US.dct")
   Me.c1RichTextBox1.SpellChecker = spell
   

   • C#

   InitializeComponent();
   var spell = new C1SpellChecker();
   spell.MainDictionary.LoadAsync("C1Spell_en-US.dct");
   this.c1RichTextBox1.SpellChecker = spell;
   

6. Set the Text property for RichTextBox control to add content for spell checking.
   • Visual Basic
   • C#

   • Visual Basic

   Me.c1RichTextBox1.Text = "Hello World! Weelcome to the most complete rich text editor availible for WPF. Load, edit, and save formattted text as HTML or RTF documents with ComponentOne RichTextBox for WPF. The C1RichTextBox control provids rich formatting, automatic line wrapping, HTML and RTF import/export, table support, images, anotations, and more."
   

   • C#

   this.c1RichTextBox1.Text = "Hello World! Weelcome to the most complete rich text editor availible for WPF. Load, edit, and save formattted text as HTML or RTF documents with ComponentOne RichTextBox for WPF. The C1RichTextBox control provids rich formatting, automatic line wrapping, HTML and RTF import/export, table support, images, anotations, and more.";