You can change the square brackets used to include tags or scripts in text to arbitrary strings, if desired, via the document's TagOpenParen and TagCloseParen properties. This may be a good idea if your document contains a lot of square brackets - by default, they will all trigger expression parsing which can consume a lot of resources even if not affecting the result visually. So, for instance this:

To write code in Visual Basic

doc.TagOpenParen = "@@@["
doc.TagCloseParen = "@@@]"

To write code in C#

doc.TagOpenParen = "@@@[";
doc.TagCloseParen = "@@@]";

will ensure that only strings surrounded by "@@@[" and "@@@]" are interpreted as expressions.

The expression brackets can also be escaped by preceding them with the backslash symbol, for instance this code:

To write code in Visual Basic

Dim doc As New C1PrintDocument()
doc.Body.Children.Add(new RenderText("2 + 2 = \[2+2\]"))

To write code in C#

C1PrintDocument doc = new C1PrintDocument();
doc.Body.Children.Add(new RenderText("2 + 2 = \[2+2\]"));

will produce the following text in the generated document:

because the brackets were escaped.

The property TagEscapeString on the document can be used to change the escape symbol to an arbitrary string.