backward compatibility issues
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Consider the following version 1 class type (used by old clients): Public class Class1 { Public Prop1 {get;set;} Public Prop2 {get;set;} } In the new server version, a property was moved to a base class (not known to the old client): Public class BaseClass1 { Public Prop1 {get;set;} } Public class Class1 : BaseClass1 { Public Prop2 {get;set;} } "Class1" actually has the exact same structure, but the property "Prop2" is not directly held by it and moved to a base class. I tried to check the XML serialized from the new server to an old client and it seems the same, however, some properties are being serialized correctly and some aren't (the Classes demonstrated here are just an example - the true classes has many properties inside). Is such a change supported by WCF? Is there a way to bypass this problem (the old clients cannot be modified)?