Move your text caret into a pair of braces or parentheses that are not properly balanced and watch the mismatched pair highlight. Correct your code before wasting a build.
Enable or disable this feature in the Visual Assist options dialog.
Visual C++ 6 users may select the foreground brace color only using the Visual Assist options dialog. Visual Studio users can specify both foreground and background brace colors via the Tools | Options | Environment | Fonts and Colors property page of the IDE.