This tutorial demonstrates how to attach the C1EditorExtender to a TextBox control, allowing users to edit text within the editor.
<cc1:C1EditorExtender ID="TextBox1_C1EditorExtender" runat="server"
FontNames="Arial,Courier New,Garamond,Tahoma,Times New Roman,Verdana,Wingdings"
FontSizes="VerySmall,Smaller,Small,Medium,Large,Larger,VeryLarge"
SimpleModeCommands="Bold,Italic,Link,BlockQuote,StrikeThrough,InsertDate,InsertImage,NumberedList,BulletedList,InsertCode"
TargetControlID="TextBox1">
</cc1:C1EditorExtender>
In the next step you will set some of the extender properties.