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ServiceContractAttribute 

• Name  and Namespace – The name and namespace of the contract in the WSDL <portType> element we can modify by specifying this two attribute. Default name is same as the contract type and http://tempuri.org. It is always recommondable to use Namespace to specify proper namespace which remove the conflict of the datatype/contract.
• CallbackContract – It is used to mention the return contract in a two-way (duplex) conversation.
• HasProtectionLevel and ProtectionLevel – Specifies whether all messages supporting the contract have a explicit ProtectionLevel value.
  Default ProtectionLevel is ProtectionLevel.None.
• ConfigurationName – The name of the service element in the configuration file to use.
• SessionMode – This is to specify whether the contract requires a binding that supports sessions.

Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.servicecontractattribute.aspx

OperationContractAttribute
Name: The name of an operation is part of a service contract. Default is the method name.
Action
ReplyAction
IsOneWay
ProtectionLevel
IsInitiating
IsTerminating
AsyncPattern: To asynchronously using a Begin/End method pair
Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.operationcontractattribute.aspx

DataContractAttribute 
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.aspx

DataMemberAttribute 
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datamemberattribute.aspx

MessageContractAttribute
IsWrapped
ProtectionLevel
WrapperName
WrapperNamespace
Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.messagecontractattribute.aspx

MessageHeaderAttribute
Name
Namespace
ProtectionLevel
Actor
MustUnderstand
Relay
Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.messageheaderattribute.aspx

MessageBodyMemberAttribute
Name
Namespace
ProtectionLevel
Order
Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.messagebodymemberattribute.aspx

FaultContract
Ref: http://msdn.microsoft.com/en-us/library/system.servicemodel.faultcontractattribute.aspx