Which control CSharpcorner use for get Topic(Post) and articles?

Hello everyone anybody have idea that which control csharpcorner use for get post and article from user because when we will was write post so we can include both text and image together in same textbox or textarea.

and second one is we send .doc file as a article to csharpcorner and then which mechanism it use for convert our .doc to as a HTML which include text and image both on its same position who we send.

kindly reply for both scenario.