LazyloadingEnable is true not require KnowType?

In WCF base type can’t refer the derived types implicitly so we uses-à KnowType attribute.

[knowType(b)]

[DataContract]

Class  a

{

}

Class b: a

{

}

Then wcf runtime serialize the data of b along with a type. Which is more simple with the help of EF 4.0 onwords we no need to set KnowType attribute.

If we set  LazyLoadingEnable=true  all referenced type of current type automatically loads.

Ex:

 Service side :

so all type they can load reference type details also

Products---> has 2 keys which loads referenced details also.

then

at client desiplay details