Most of the web applications will not let you use HTML as form input for security reasons. And this is why BlogEngine has BBCode extension - to provide you with ability to define which HTML tags you want visitors be able to use. But it has it's own limitations and can't handle some of the HTML tags without little overhead. For example, I wanted to let visitors to use images in their comments, so I went to extension manager/BBCode and defined [img] code. Problem here is that image tag has specific syntax and BBCode does not set to handle it. I had to modify Parse method to process image tag properly. All I did is added a check to see if code is "img" and, if it is, I use custom parsing. Otherwise BBCode uses default code processing. More...