做一个文本编辑控件，设置字体的格式等功能必不可少。RichTextBox作为.Net提供的富文本控件，成为很多人做文本编辑器的首选。本文将要讨论就是针对RichTextBox控件的设置粗体、斜体、下划线等功能的相关问题。-Make a text edit control, set the font formatting and other functions is essential. As RichTextBox. Net provides a rich text control, a lot of people do a text editor of choice. This will be discussed is the setting for the RichTextBox control bold, italic, underline and other functions related issues.