Often, assemblies are distributed to vendors to consume your code. Changes to such assemblies are always hectic to manage. If we are removing or switching methods or properties in a class, you can mark them with the ObsoleteAttribute decorator. See below for an example:

//we are marking the below property "King" as obsolete[ObsoleteAttribute("This property will be removed soon. Please switch to Emperor.", false)]public static string King{ get { return "king"; } }//we are going to use this in future.public static string Emperor{ get { return "emperor."; } }Using Obsolete class to let your vendors know of the upcoming changes that could break their code