Cute Editor for ASP.NET is by far the fastest, easiest, most powerful WYSIWYG HTML Editor for ASP.NET. It's also available for PHP and ASP.
It enables ASP.NET Web developers to replace any textbox with an intuitive Word-like WYSIWYG html editor.
It empowers business users to make content updates...
More information
Extended WPF RichTextBox Implements below features:
AppendText Overload with input parameters as line color, text size, AppendNewLine, Save Content, Load Content (Xaml and Text Format)