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WCF Interview Questions and Answers

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Question - What are the duplex contracts in WCF?

Answer - In WCF, Duplex messaging or call-back is used to communicate with the client. Over different transport system Duplex messaging in WCF is done like TCP, Named pipe and even HTTP. Collectively this is known as duplex contracts in WCF. Basically duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently. A duplex service, therefore, can send messages back to the client endpoint, providing event-like behavior. Duplex communication occurs when a client connects to a service and provides the service with a channel on which the service can send messages back to the client. Note that the event-like behavior of duplex services only works within a session.

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Session state has created a session id, but cannot save it because the response was already flushed by the application.

Server Error in '/' Application.

Session state has created a session id, but cannot save it because the response was already flushed by the application.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Session state has created a session id, but cannot save it because the response was already flushed by the application.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[HttpException (0x80004005): Session state has created a session id, but cannot save it because the response was already flushed by the application.]
   System.Web.SessionState.SessionIDManager.SaveSessionID(HttpContext context, String id, Boolean& redirected, Boolean& cookieAdded) +4473175
   System.Web.SessionState.SessionStateModule.CreateSessionId() +95
   System.Web.SessionState.SessionStateModule.DelayedGetSessionId() +109
   System.Web.SessionState.SessionStateModule.ReleaseStateGetSessionID() +24
   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +854
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +142
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +93

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4805.0