• Service contracts
• Data contracts
• Message contracts
• Fault Contract 
• Operation contract
• Policies and Binding

   [ServiceContract]
    public interface IService1
    {

        // TODO: Add your service operations here
    }

   public interface IService1
    {
        [OperationContract]
        string GetData(int value);

        [OperationContract]
        CompositeType GetDataUsingDataContract(CompositeType composite);
  
    }

    [DataContract]
    public class Student
    {
        private string _Name;

        private string _City;


        [DataMember]
        public string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }
}

[ServiceContract]
    public interface IGetDetailsService
    {
        [OperationContract]
        [FaultContract(typeof(Student))]
        Student GetDetails(string Name);
    }

    [DataContract]
    public class Student
    {
        private string _Name;

        private string _City;

        [DataMember]
        public string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }

        [DataMember]
        public string City
        {
            get { return _City; }
            set { _City = value; }
         }
}

[MessageContract]
public class Person
{
  [MessageHeader] public Operation Name;
  [MessageHeader] public string city;
  [MessageBodyMember] private Home Address;
  [MessageBodyMember] private Home Streat;
  [MessageBodyMember] public int age;
}

1. Throttling Behavior
2. Error Behavior 
3. Metadata Behavior
4. Instance Behavior 
5. Transaction Behavior
6. Dispatch Behavior 
7. Concurrency Behavior
8. Parameter filtering
9. Message inspection

• Throttling Behavior- Controls how many messages are processed.
• Error Behavior - Specifies what occurs, when internal error occurs on the service.
• Metadata Behavior - Tells how and whether metadata is available to outside world.
• Instance Behavior - Specifies how many instance of the service has to be created while running.
• Transaction Behavior - Enables the rollback of transacted operations if a failure occurs.
• Dispatch Behavior - Controls how a message is processed by the WCF Infrastructure.
• Concurrency Behavior-Its used to control how many threads can access a given instance of service. 
• Parameter filtering-It filters the message headers and executes preset actions based on the filters of the message headers. 
• Message inspection-Its used to inspect specific part or all parts of  the message through service.

1. Transport Channels
2. Protocol Channels  

Activation and Hosting in WCF

1. Support for different protocol
2. Security over transport as well as Message level
3. Easy to implement MSMQ and REST Service.
4. Load balancing & support scaling.
5. It can control concurrency.
6. It can be hosted on IIS, WAS, Self hosting, Windows services.
7. Multiple Message Patterns.
8. Unhanded Exceptions does not return to the client as SOAP faults. WCF supports better exception handling by using Fault Contract.

• Creating WCF Service 
• End Points in WCF 
• Consuming WCF Service in Web Application