SmartFormat
A lightweight text templating library written in C#
...More than that SmartFormat can format data with named placeholders, lists, localization, pluralization and other smart extensions. High performance with low memory footprint. Minimal, intuitive syntax. Formatting takes place exclusively at runtime. Exact control of whitespace text output. string.Format compatibility mode and SmartFormat enhanced mode. Most common data sources work out-of-the-box. Many built-in formatting extensions. Custom formatting and source extensions are easy to integrate.