Can a WCF operation contract return a boolean value?

Is the following signature correct (in VB)?

<OperationContract()>
Function Validate(Byval Param As Integer) As Boolean

I heard t开发者_如何转开发hat "Operation contracts" cannot return boolean values. Is it true or it is a blunder? Of course, I did not test it yet.

According to this document and the example provided:

http://msdn.microsoft.com/en-us/library/ms730255.aspx

if you are using a MessageContract parameter, then you CAN NOT return boolean.

Yes, you can return a boolean.

Operation Contracts can return almost all types, including boolean, void.