c# - How to make WCF Service take only one call at a time -

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we have wcf service 

public class myservice  {   [operationcontract]  public void opperationa()   {   }   [operationcontract]  public void opperationb()  {   }   [operationcontract]  public void opperationc()  {   }   [operationcontract]  public void opperationd()  {   } }

we have client wcf service windows service invokes operations above operationa/b/c/d new proxies.

with current implementation have there issues client invoking operations @ same time.
instancecontextmode = percall , concurrencymode = single

is there combination of instancecontextmode , concurrency can change service take 1 request @ time, mean if client proxy has called operationa , service processing request , if client proxy b tries call operationb (or other operation), should blocked until first request finished.

thanks

it should sufficient change instancecontextmode single. msdn documentation here:

concurrencymode=single : service instance single-threaded , not accept reentrant calls. if instancecontextmode property single, , additional messages arrive while instance services call, these messages must wait until service available or until messages time out.


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