An object representing the parameter at the specified index.
If out parameters are not available, ASP.NET throws an InvalidOperationException when accessing the SoapMessage.GetOutParameterValue(int) property.
In a System.Web.Services.Protocols.SoapClientMessage the out parameters are available in the SoapMessageStage.AfterDeserialize System.Web.Services.Protocols.SoapMessageStage. In a System.Web.Services.Protocols.SoapServerMessage the out parameters are available in the SoapMessageStage.BeforeSerialize of the System.Web.Services.Protocols.SoapMessageStage.