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WCF Services uses DataContractSerializer by default. when WCF tries to serialize the entities that have relationships with other entities, it embeds them inside each other multiple times by default. When we use Entity Framework and poco entities that have bi-directional relationships, if we need to return those entities from WCF methods, we get exception and circular references cause the serialization to fail. we need to tell DataContractSerializer to preserve the object references and act smarter and link objects together rather than copying multiple times. There is a parameter in DataContractSerializer constructor that can be using System.ServiceModel; using System.ServiceModel.Description; using System.ServiceModel.Channels; using System.ServiceModel.Dispatcher;         public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters)         {         public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation)         {         public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation)         {         public void Validate(OperationDescription operationDescription)         {             if (operationBehavior == null)                 return;         public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList knownTypes)         {. HOW TO RETURN ENTITIES THAT HAVE CHILDREN WITH SPECIFIC CRITERIA IN ENTITY FRAMEWORK CODE FIRST. گر تو سبزی، سبزم. گر تو شادی ،شادم..من از شیرینی تو فرهادم وطنم..ایرانم..عید