System.Windows.Forms 1.0.5000.0 2.0.0.0 System.Enum The class uses this enumeration internally. Specifies whether any characters in the current selection have the style or attribute. Field System.Windows.Forms.RichTextBoxSelectionAttribute All characters. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.RichTextBoxSelectionAttribute Some but not all characters. 1.0.5000.0 2.0.0.0 Field System.Windows.Forms.RichTextBoxSelectionAttribute No characters. 1.0.5000.0 2.0.0.0