[OperationContract]
MyCollectionClass GetList(int sessID, string name);

  [CollectionDataContract]
public class MyCollectionClass : List<MyClass>{ }

  [DataContract]
public class MyClass {

  [DataMember]
  public string Prop1 { get; set; }

  [DataMember]
  public string Prop2 { get; set; }

maxBufferSize="2147483647"
maxReceivedMessageSize="2147483647"

readerQuotas:
  maxArrayLength="2000000"
  maxStringContentLength="2000000"/>

<system.serviceModel>
   <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
</system.serviceModel>

<system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
    <behaviors>
         <serviceBehaviors>
             <behavior>
                 <serviceMetadata httpGetEnabled="true"/>
                 <serviceDebug includeExceptionDetailInFaults="true"/>
                 <dataContractSerializer maxItemsInObjectGraph="2147483647"/>  <!--this very is important: it is the size of the buffer-->
             </behavior>
         </serviceBehaviors>
     </behaviors>
  </system.serviceModel>