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An object representing the return value of the XML Web service method.
If a return value is not available, ASP.NET throws InvalidOperationException when accessing the SoapMessage.GetReturnValue property.
In a System.Web.Services.Protocols.SoapClientMessage the return value is available when the System.Web.Services.Protocols.SoapMessageStage value is SoapMessageStage.AfterDeserialize. In a System.Web.Services.Protocols.SoapServerMessage the return value is available when System.Web.Services.Protocols.SoapMessageStage value is SoapMessageStage.BeforeSerialize.