Make Property or Class Obsolete

Problem
Need to make class property obsolete so developers will not use it.

Solution
Set property to "obsolete" in code to cause a compile warning or error:

 [System.Obsolete("Deprecated: Don't use OldWay; use NewWay instead", true)]
 public string Xxx
 {
  get
  set
 }

References
"Obsolete (C#)." MSDN: Microsoft Development, MSDN Subscriptions, Resources, and More. 18 Feb. 2009
http://msdn.microsoft.com/en-us/library/22kk2b44(VS.80).aspx.