RadRichTextBox is a control that is able to display and edit rich-text content including formatted text arranged in pages, paragraphs, spans (runs), etc.
RadRichTextBox has been replaced by RadRichTextEditor. Plese refer to the following help article demonstraing how to upgrade: Upgrading to RadRichTextEditor
RadRichTextBox and RadSpellChecker require .NET Framework 4.0.
As a .NET 4.0 component, in order to be able to theme it in Visual Style Builder, you need to use the .NET 4.0 version of the tool, available in: C:\Program Files (x86)\Telerik\UI for WinForms\Version\Bin40
Rich Text Formatting - Telerik RadRichTextBox control allows you to edit text and apply rich formatting options, like:
Underline, Strike Through
Text color and background
Bullet and numbered lists
Paragraph alignment and indentation
Show/Hide formatting symbols
Superscript and Subscript
SpellChecker - extensible spell checking for different languages, using built-in or custom dictionaries.
Multi-level Undo/Redo Support - Telerik RadRichTextBox provides desktop-like usability and control thanks to its multilevel Undo/Redo feature. It allows past actions to be reviewed and reversed, just like in Microsoft Word.
Two types of layout – Paged and Flow (as text in an HTML page viewed in a browser).
Multi-region selection - the built-in multi-region support enables you to perform various operations for more than one selection simultaneously.
Import/export - with Telerik RadRichTextBox control you can load XAML, HTML, RTF, DocX (rich-text) or TXT (plain text) into the control, you can format and edit it and then export it back to any of the above formats or PDF.