C# Class to format strings like excel

Create a C# class that parses and formats string values (numeric and text) using the format descriptors for Excel. US-ENGLISH ONLY. Must follow the Office Open XML spec for four part formatting strings. Will be comparing built in and custom formats to Excel 2003, 2007, and 2010. ## Deliverables Following section 3.8.31 from the Office Open XML Part 4 - Markup language Reference (see attached.) **US EN only.** I recommend using Excel to validate your code. Class must be compatible with WPF and Silverlight.