ECMA-334 C# Language Specification

14.5.3: Parenthesized expressions

A parenthesized-expression consists of an expression enclosed in parentheses.

parenthesized-expression
( expression )

A parenthesized-expression is evaluated by evaluating the expression within the parentheses. If the expression within the parentheses denotes a namespace, type, or method group, a compile-time error occurs. Otherwise, the result of the parenthesized-expression is the result of the evaluation of the contained expression.