As others have said, there isn’t.
Personally I would avoid creating them in the first place though – I would use an embedded resource instead. They’re pretty easy to work with, and if you have a utility method to load a named embedded resource from the calling assembly as a string (probably assuming UTF-8 encoding) it means that:
- If your embedded document is something like SQL, XSLT, HTML etc you’ll get syntax highlighting because it really will be a SQL (etc) file
- You don’t need to worry about any escaping
- You don’t need to worry about either indenting your document or making your C# code look ugly
- You can use the file in a “normal” way if that’s relevant (e.g. view it as an HTML page)
- Your data is separated from your code