Asynchronous Execution in ADO.NET 2.0: ASP Alliance

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Asynchronous Execution in ADO.NET 2.0

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by Satheesh Babu
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Points to consider

Since the database operation is executed in a separate thread, if an exception occurs then the operation is signaled as complete and the actual exception will be thrown if we call End method. So we have to make sure that we are having proper exception handling code in this scenario.

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User Comments

Title: f
Name: f
Date: 2012-09-29 7:03:06 AM
Comment:
f

Title: thank you
Name: khoa
Date: 2011-06-12 7:21:13 PM
Comment:
very good code and article

Title: Code Monkey
Name: King Kong
Date: 2009-10-29 12:20:15 PM
Comment:
This is a great article. Very concise and to the point.

Title: InvalidOperation exception
Name: Ross
Date: 2009-01-29 9:36:34 AM
Comment:
Kevin - Is the DB connection still open at the point you call EndExecuteReader()?

Title: InvalidOperation exception
Name: Kevin Burton
Date: 2008-12-18 11:42:00 PM
Comment:
I have some code that I was trying to improve by adding the new asynchronous SQL methods Begin... and End.... But when I add it to my code I get an exception:

InvalidOperationException.
{"The asynchronous operation has already completed."}

The first few frames of the stack trace look like:

at System.Data.SqlClient.SqlCommand.VerifyEndExecuteState(DbAsyncResult
dbAsyncResult, String endMethod)
at System.Data.SqlClient.SqlCommand.InternalEndExecuteReader(IAsyncResult
asyncResult, String endMethod)
at System.Data.SqlClient.SqlCommand.EndExecuteReader(IAsyncResult
asyncResult)

In searching the internet I see that at least one other person has seen this problem. I was wondering if there is a work around? If anyone has gotten the asynchronous methods to work without this exception I would very much appreciate their tips. I would also welcome a confirmation message of simply "this is a known bug".

Comments?

Thank you.

Kevin

Title: very useful
Name: RuneAletheia
Date: 2008-12-16 3:24:03 PM
Comment:
this article was very helpful at explaining basic implementation of async -- also, the updated link to the reference is:

http://nayyeri.net/blog/Asynchronous-command-execution-in-NET-2-0/

Title: Very Good
Name: Sunil Dhiman
Date: 2008-07-04 12:17:38 AM
Comment:
this article helped me very much.
thanks.

Title: Very Good
Name: Samim Mondal
Date: 2008-04-02 3:16:42 AM
Comment:
Its very good article....

Title: RE:Thank you
Name: satheesh babu
Date: 2008-03-24 12:55:18 PM
Comment:
Thanks for the comments guys!!
Satheesh
http://www.codedigest.com

Title: Thank you
Name: Beri
Date: 2008-03-24 12:51:21 PM
Comment:
I've been struggling to make sense of Asynchronous Transcations. This article has helped me a lot. Thank you very much Sateesh.

Title: Mrs
Name: JayaNayagam
Date: 2008-01-07 1:14:14 AM
Comment:
The author explains quite clearly,quite useful.

Title: Nice info
Name: Abhishek Kumar Singh
Date: 2007-12-20 4:41:16 AM
Comment:
nice one

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