When overridden in a derived class, asserts that the current SoapMessageStage stage is a stage where out parameters are available.
Assembly: System.Web.Services (in System.Web.Services.dll)
The asserted stage is different for XML Web service clients and XML Web service methods. An XML Web service method's out parameters are available prior to the SOAP response serialization process in the BeforeSerialize stage. In an XML Web service client, the out parameters are available after the SOAP response deserialization process in the AfterDeserialize stage.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.