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Internal Connection Fatal Error  Exception on calling Cancel on Asynchronous Call

Posted on 2010-11-12
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Last Modified: 2012-05-10
I am using BeginExecuteNonQuery to call a long running stored procedure asynchronously. When the user wishes to cancel the operation I call the Cancel method .It works fine for the first time.Suppose user start the query again and cancels it the next time i get the following Exception System.InvalidOperationException: Internal Connection fatal error
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Question by:shore-support
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Expert Comment

by:Richard Lee
ID: 34119287
Are you closing all the Connection or Transactions?

DaTribe
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Expert Comment

by:Richard Lee
ID: 34119289
I should have said Disposing of your Transactions.

DaTribe
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Author Comment

by:shore-support
ID: 34119363
I am taking care of clearing the transaction and connection in the Method that'll be invoked in the PostAsyncCall.When the transaction has passed through successfully i get the transaction object in this Method and commit it but when it is cancelled i see that the transaction object returned in this Method is null
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LVL 18

Expert Comment

by:Richard Lee
ID: 34119604
Firstly a null object doesn't mean that what this object was referencing previously has been disposed. Yes the object is abandoned but garbage collection is non-deterministic. What I am getting at is as follows:

If in your BeginAsync you create a transaction and in your PostAsync you dispose of it, then if we replace the PostAsync with CancelAsync disposing of the transaction should still be done here before setting the transaction object to null.

DaTribe
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Author Comment

by:shore-support
ID: 34119850
When the user doesn't cancel the operation i get to see the Transaction Object in the IAsync Result which is passed to the Delegate and i commit the transaction and close the connection but when user Cancels i get null as the Transaction object in the same Delegate. I have even tried to use a global parameter for the Transaction and the Connection but i see even this Connection is closed in case of Cancel.
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Expert Comment

by:Richard Lee
ID: 34120042
Lets try again:

1. Is there an InnerException?
2. How is the transaction & connection being closed?
3. What is in the EventLog?
4. Implement some Debug.Trace to see what is happening.

DaTribe
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Author Comment

by:shore-support
ID: 34246996
Thanks. We are trying the above approach to resolve the issue.
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Richard Lee earned 500 total points
ID: 34291395
Any progress?
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