The C# and VB syntax languages that ship with the optional .NET Languages Add-on (sold separately) provides syntax highlighting, parsing, AST construction, syntax error reporting, code outlining (folding), automatic IntelliPrompt (code completion, quick info, parameter info, code snippets, etc.), type/member drop-down functionality, and much more.

SyntaxEditor supports merging of multiple language lexers together as seen here, where HTML can transition to Javascript and ASP. Nearly all of the rich editing features found in the Visual Studio code editor come packed in SyntaxEditor, such as line modification marks, visible whitespace, current line highlights, rectangular selection, and more.