Communication state defines the states in which a communication-oriented object can exist.
These states are defined as enumerations in the System.ServiceModel.dll.
http://msdn.microsoft.com/en-us/library/system.servicemodel.communicationstate(v=vs.110).aspx defines the various names in the enumeration however we do not get to see the enumeration values.
As the above link explains there are four main states that a communication-oriented object can exist. They are:
The transitory states of the communication-oriented object are:
The various state diagrams are shown below.
(Image from http://msdn.microsoft.com/en-us/library/ms789041(v=vs.110).aspx )
The enumeration is actually defined as:
public enum CommunicationState
So Created = 0, Opening = 1 and so forth.
Please refer to http://msdn.microsoft.com/en-us/library/ms789041(v=vs.110).aspx for a complete understanding of the state machines.