How to throw or catch sql exception for executeReader sql adapter

Wcf sql adapter was created and executeReader was used.
When an invalid sql statement was constructed and send it to wcf sql adapter, it will hanging there, and no response. No exception was catched even though send chape was inside a catch block. How can I catch this kind of exception
or throw this exception ? I need to give client an exception resposne.
thanks
Gary

I used scope with exception handle which has Exception object type: "System.SystemException".
I guess this type "System.SystemException" can catch any exception, including sql exception. Maybe I am wrong. I got error from window event:
A message sent to adapter "WCF-Custom" on send port "WcfSendPort_SqlAdapterBinding_DalCore_Custom" with URI "mssql://shig-quad-2k3e1//DataSourceOne?" is suspended.
Error details: System.Data.SqlClient.SqlException: Incorrect syntax near '='.
Server stack trace:
   at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndRequest(IAsyncResult result)
Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at System.ServiceModel.Channels.IRequestChannel.EndRequest(IAsyncResult result)
   at Microsoft.BizTalk.Adapter.Wcf.Runtime.WcfClient`2.RequestCallback(IAsyncResult result)
MessageId: {B24EF5B8-298A-4D4F-AA98-5E639361A7DB}
InstanceID: {F8924129-265B-4652-B20E-8D25F8F20A51}
If "System.SystemException" can't catch all exception, which type can catch all exception ? I want to catch all exception in this catch block.
thanks
Gary

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