>According to standard .Net naming guidelines

This written at the age of framework 1.1. many naming of enumeration was plurality e.g [Colors](http://msdn.microsoft.com/en-us/library/system.windows.media.colors.aspx) . See the new version **Naming Enumerations** of [Naming Guidelines](http://msdn.microsoft.com/en-us/library/ms229040.aspx)