Problem with Multiple Async Calls to WCF: WCF, Async calls, .net

Problem with Multiple Async Calls to WCF

Hello,

I'm making multiple async calls to WCF from my UI with a loop. The code at the client works fine for these multipe calls with different data. However at the server side, only gets the last call made (the data at the server end gets last data posted).
The method SaveImportTemplateAsync() gets called from the Front end in a loop with pages of data.

One interesting thing i noted here is, if I introduce a sleep after the WCF call (SaveImportBusinessObjectAsync()), then this seems to work fine. But having a sleep in between, dosen't seem to be a good idea, as you never know the size and processing time of the server. I'm sure there should be a better way to write this code.

Te data gets passed through parameter and the onCompleted method gets called after every completion.

I did do the trace and interestingly the data from the client seems to be good, but at the server end only the last submitted data gets there. That is, If i make 10 calls with 10 different type of data

At the client, data sent is 1, 2,3,4,5,6,7,8,9,10

At the server the data that gets recieved is: 10,10,10,10,10,10,10,10,10,10

Also the callback is called 10 times with the data being always the last one ("10").
Note: Here the data depicted is for sample purposes only. The data i send is DTO with about 2K data in each batch.

I also tried by creating the proxy only once and making multiple calls in a loop after it, but I still have the same problem.

I'm not sure if i'm doing anything wrong, please help!

Thanks in dvance

public void SaveImportTemplateAsync(IObjectDTO BusinessObjectData, long requestID)
{
   BusinessObjectDataDTO businessobject = (BusinessObjectDataDTO)BusinessObjectData;
   importRequestID = requestID;
   try
   {
      ServiceContractClient ServiceClient = CreateServiceClient();
      ServiceClient .SaveImportBusinessObjectCompleted += new EventHandler<SaveImportBusinessObjectCompletedEventArgs>(ServiceClient_SaveImportBusinessObjectCompleted);
 
      ServiceClient .SaveImportBusinessObjectAsync(businessobject, requestID); 
   }
 
   catch (System.ServiceModel.FaultException<BusinessObjectService.WCFError> error)
   {
        // do something
   }
 
} 
 
private void businessObjectServiceClient_SaveImportBusinessObjectCompleted(object sender, SaveImportBusinessObjectCompletedEventArgs args)
{
   batchCount++;
   if (batchCount == totalBatches)
   {
      // Do something to say that all requests are processed
   } 
}
 
public static ServiceContractClient CreateServiceClient()
{
BusinessObjectService.ServiceContractClient clientInstance = null;
try
{
lock (lockerInstance)
{
using (var clientproxy = new CreateServerProxy())
{
clientInstance =clientproxy.CreateServiceClient();
if (clientInstance == null) throw new ApplicationException("Could not connect");
}
}
}
catch 
{
throw;
}
return clientInstance;
}

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Problem with Multiple Async Calls to WCF

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WCF

Async calls

.net

Web Services and WCF

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