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Concurrency: What Every Dev Must Know About Multithreaded Apps

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

Multithreading offers lots of benefits, but it's not a technique you can employ willy nilly without first learning about all the potential pitfalls. To get you started, Vance Morrison covers multithreading and the shared memory threading model, race conditions and how concurrent access can break invariants. He also discusses how to use locks so you can understand the costs involved.

Vance Morrison

MSDN Magazine August 2005

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Writing applications that use multiple threads is often considered an advanced programming task, prone to errors. In this month's column, I'll focus on a practical application of multithreading in Windows® Forms applications with some real benefits, while attempting to keep things simple. My goal is to present multithreading in an approachable way that addresses a very common need: writing applications with a user interface that remain responsive to the user.

How to turn off optimistic concurrency checking?


I have run into a problem with optimistic concurrency in my dynamic data application (where all relevant settings are at their default values); when I try to update or delete one of my tables, I see the following error:

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I am the only user of my database at the moment, so I can guarantee that the data both exists and has not been changed outside the application!

Various forums have suggested that the way to deal with this is to set the column attributes so that the concurrency checking is disabled; i.e.

[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_PropSurname", DbType="NVarChar(255)", UpdateCheck=UpdateCheck.Never)]

However, to do this manually through the Visual Studio designer will take me hours (I have a lot of tables) and if I then change the schema of one of the tables in the DB, won't I then have to do it all again?  I've tried editing the .designer.cs file directly but my changes are subsequently overwritten (as expected).

All suggestions gratefully received!

Ed Graham

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Hi Guys,


I would like to develop a mobile application such as the one you find in iPhones but I don't know from where to start!!? I'm not looking for something complicated, just an a static application of an eBook that users can read an flip the pages, I don't think that you can do such animation easily in ASP.net so does anyone knows what tool that I can use to develop such application?






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