17.4 Reserved attributes
Visual Studio .NET 2003
A small number of attributes affect the language in some way. These attributes include:
System.AttributeUsageAttribute(Section 17.4.1), which is used to describe the ways in which an attribute class can be used.System.Diagnostics.ConditionalAttribute(Section 17.4.2), which is used to define conditional methods.System.ObsoleteAttribute(Section 17.4.3), which is used to mark a member as obsolete.
