c# - WCF transaction disappearing between client and server -

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i have wcf service. have client makes asynchronous calls service. have 45 test records. client gets each record database , calls wcf service asynchronously.

when test each record individually, service processes records expected. when pass 45 @ same time (45 calls made 1 after other in foreach loop) 1 record never makes service. same record, every time not make service.

i've enabled trace logging on both client , server side, , on client side can see missing message making call server. on server trace logs can see no sign of record.

anyone ideas why/what might happening? suggestions of further steps try , bottom of it?

i thought might memory issue of records large (they contain excel data). on passing in subset largest records, process correctly , none go missing!

thanks in advance or suggestions.


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